For most parts you can fit them yourself... a roll of blue painter's tape and a full length mirror will be your best friends for this. It does help to have someone when getting fully kitted up, but is not a 100% necessity.
I would highly suggest starting your own build thread, and here is why:
1. You can ask as many questions as you like. As Erick stated, "No question is stupid or unimportant" and you will get more responses.
2. You can (and should) post progress pictures, and lots of them! This especially helps when you have an issue. Seeing an actual photo makes it MUCH easier to help.
3. Keeping everything in one thread helps you (and us) keep track of your progress.
4. Since others may have a similar issue or question it can help them as well.
One thing to keep in mind is that building a quality set of armor takes time. Like all of us, I'm sure you want to get it done and start trooping, but rushing leads to mistakes. When in doubt, always measure twice (or more), and ask for advice before cutting. Consider this a marathon and not a sprint and you will come out with a truly spectacular set of TK armor.