If you're new to sewing with a machine and you find that your seams are wobbly: keep your eyes on the edge of the fabric as it goes through under the sewing foot. I remember that when I first started I stared at the machine needle - but looking at the fabric edge gives you a more even result.
Take it slow
It is so tempting to race through stitching something together but puckers and slipped layers are very frustrating. Take it slow when sitting at your sewing machine: check that all your layers are lying flat and that no fold of fabric got in the way. Particularly when sewing in sleeves...
Sew shortest seams first
When you have a narrow collar or buttonband, or any similar pattern piece, that you need to sew to something at its narrow end - sew those seams first. If you leave this until after you sewed the longer side, it is incredibly difficult to get the angle right. The narrow end is likely to slope in one direction or other and will be too long or too tight. As a result, the garment will look less well sewn.
Sew onto flat pieces first
I did a blog post about this one. It is easier to attach pieces like a patch pocket, a pocket flap, collars, etc... to a pattern piece when it is still flat and hasn't been sewn to many, if any, other pieces. The sewing instructions that come with your pattern may have you do these kinds of pieces last but that makes it more difficult.
After all haute couture does a lot of construction in flat pieces and only pulls it all together right at the end.
Zipper length
If your sewing pattern specifies a zip of say seven inches but you can only find one of eight inches or longer, don't despair: get the longer one. If the difference is only one inch, you can let that dangle inside (easier to sew in as well!) and if longer than that then stitch the zip teeth together tightly on the inside and cut zipper off below. Worse like a charm.
Pinning a concave and a convex piece together
Put pins in perpendicular to the fabric edge but don't align the edges of the fabric pieces. The longer outside curved edge will need to pucker a little at that edge to make sure that the stitching line (the seam allowance's distance away from the edge) of both pieces gets pinned together smoothly. You can get the fabric pieces to come together flat at the stitching line when you hold the layers between a finger and thumb (at the stitching line) and make sure they are smooth and flat to the previous pin. It takes a bit of trial and error but you'll get there!
Double-folded hems
These are really tricky. Mine often produce these slight diagonally dragging lines from the folded edge to the stitching line - because one of the fabric layers shifted away from the other layer. Basting the hem may help; you can try a walking foot; or at the very least using lots of pins! Set thepins into the fabric perpendicularly. If you still have problems: do baby hems instead!
Baby hems
Try these instead of double folded hems. You need to serge/overlock the edge of your fabric to be hemmed. Then machine baste along the line where you want to fold the fabric up (before folding it) - this is using the longest straight sttich on your machine. Then fold up and press the hem with your iron: the fabric will fold easily at the machine basted/stitched line. It works beautifully! Once you have your hem pressed, stitch at a suitable distance from the folded edge from the right side. Experiment with how deep you want your hem to be or if you literally only want to fold up the serged/overlocked edge and top stitch very close to the edge (which is then called edge stitching)
Use a tailor's awl
When it is tricky to sew over the bit where one fabric layer has a seam (you get loads of those when sewing patchwork!), then use a tailor's awl to hold the seam allowance down so you can sew smoothly over this bit. A tailor's awl is a straight spike with a handle at the end. It saves your fingers from going too close to the machine's needle. Don't use your fingers too close to the needle, it's not worth it.
Pulling pins before stitching
It is tempting to sew over the pins where they hold the fabric layers together. It is safer to pull each pin as you approach it. You can either stop stitching to remove each pin, or if it is a long straight seam and you're going slow, you may be able to remove pins before you get too close to sewing over them (and before the screw at the side of the machine foot comes plunging down onto your poor fingers). If your needle ever hits a pin straight on, the machine needle can break at the neede's eye and the pointed end will fly off at a high velocity. You really don't want it ending up in your eye, take time to pull the pins instead. Much safer.
What tip would you give yourself if you could go back in time? Please post in the comments!
