If you are working with triangles, it can be a challenge for novices. If you can, as suggested before, start with larger pieces and cut to size after pressing you will be much more successful early on. This is the method i still use for half square triangles. For more complicated triangles, I mark the end points and use a pin to align the pieces. There are lots of good resources out there with many different methods. I've finally arrived at a few that work for me in different situations and you will too. Give yourself some time. :-))