i use a sussman industrial iron, which has a gravity feed water tank and makes steam on demand--this iron is so heavy that i don't have to press on the project at all, i can just lay the iron down and the weight does the rest. most likely you are using a domestic iron, which doesn't get as hot and is made of plastic to keep it lightweight. consider going to your nearest thrift store and picking up the oldest metal iron you can find. it will be heavier, it will get hotter, and if you keep it full of water it will weigh almost as much as mine does.
2--use your accessories.
those are just some of the things that make it possible for me to make a dress in an afternoon. these are presser feet for my sewing machine, they make sure everything is accurate, neat, and consistent. the accessories that came with your machine--or that are available to purchase--may be different from the ones i have, but all of them serve the same purpose: to help you do your best work.
3--make a test sample first.