Thanks - that sounds like the General Aviation adage "If you want to build; build. If you want to fly; buy". However, so much of the work seems to be building

Thanks - that sounds like the General Aviation adage "If you want to build; build. If you want to fly; buy". However, so much of the work seems to be building experience in the software and getting good at speccing the parts. How do you get good at even ordering a part so you don't waste tons of time and money?