I applaud the full size draftings. The exercise serves many purposes. Spatial relationships, resulting dimensions, and the further understanding of how a bike frame is put together all are gained to a greater extent than a scale drawing. But scale drawings are better then nothing. I would suggest that the OP get a set up to do a number of full size draftings if at all possible as the leaning process won't be complete with #1. Fancy equipment is not needed. Enough floor space, paper large enough (I used brown sign paper BITD), simple adjustable protractor, meter stick, string attached to pencil for a compass.

In time one gets more comfortable with the numbers and a full or scale drawing becomes less important. This is when an on line program (like BikeCad) comes in. Andy.