Don't be nervous - just go for it and when you've finished your first one and it fires up for the first time it's a tremendous feeling. As for parts going DOA, it can happen but it's rare and most suppliers are pretty good about it.
As you say, your research is thorough and good so your parts will gel well so good luck and wait for that feeling to cut in.
Thank you so much for your reply. You have made me feel a little more confident that i can do this.