Here is a method I have used. Start by buying another bike of similar size to your desired frame. Make sure it has a good wheel set. Then ride that bicycle till you eventually get comfortable with transferring over its components to your desired frame. I once spent about 5 years gathering the component to assemble a Franken Peugeot Dolomites. That frame just hung in the garage reminding me of its future potential till I got to it.

Ya got the frame you want, now go get a donor bike for it...

Man, I sure wish we had a bike Co-Op around here. Now days the only local Co-Op is me, some of my tools, and my skimpy parts bin. But many locals bring over good parts for it as they too build their own rides. I do so enjoy the company. Its all FUN!