Hello 
Quite ironic that the one activity that's my stress relief can sometimes make me cry too. It isn't always smooth sailing when sewing as you can hit a lot of roadblocks and make a lot of errors.
Here are a few tips and tricks when sewing:
- When you're tired, stop. This has helped me avoid making silly errors. I find out that when I'm tired and keep cutting or sewing a piece, I usually mess it up. You need to be in a right frame of mind when handling a piece, especially if it's for a client.
- Service your sewing machine. Whatever type of machine you use, it should be serviced. Personally I oil my treadle machine a lot and it runs smoothly.
- Get the right tools. I'm guilty of using paper scissors instead of getting the fabric shears. It makes it hard cutting accurately and can be a problem to the overall garment. Get a long ruler, a French curve, lots of pins, needles, all supplies to make it easier.
- Iron press as you sew. This cannot be overemphasized. I used to be too lazy to iron as I sew and would just leave it for when I was done sewing. I started ironing every step and saw a huge difference. Your garment comes out way nicer and neater when you iron press, plus it makes it way easier to sew.
- Notch curve edges and trim corners. This helps your necklines and armholes sit nicely, avoiding wrinkles. When making V-necklines, notch right under the V stitch to let it sit well.
- Cut out your pattern on paper first. This helps if you're unsure about your pattern and it helps you avoid make mistakes directly on the fabric.
- Remember the little details. Trim off excess fabric, trim off hanging threads and finish your seams properly.
These are my few tricks, please do share some more!