Personally, I don't have a clue. When my Technics 200W amp packed it in on one channel a looong time ago, life and kids and job consumed everything and music was not a priority for quite a few years.
Finally I had time, but didn't want to spend megacoin, but of course wanted the best sound I could get. I found Bottlehead, bought a FPII (11+ years ago now), assembled the proper tools like a temp controlled solder stn, good meter, etc, and built my first kit ever. I can read and follow instructions very well, and the support forum convinced me I could do it. And damn, it actually WORKED!!!! I went on to do some tweaks based on info on the forum, and then built a set of Paramours and a Seduction based on my success with the FP. And they worked too, and continue to work to this day.
A few months ago I bought Doc's Vinyl Lover's Deal and am now building a whole new system - Eros, BeePre, and Paramounts. I still have no clue as to how this really all works. My friends and family are all amazed at the results and the awesome sound. As am I of course. I love my system, and I am extremely proud that I built it.
I remember when I first got things running, my youngest son had some friends over and they were listening and he said "Look at this guys -- no tone controls!!!" A very interesting observation I thought.
If you really want to get overwhelmed, try reading some of the digital forums, even on this board. Yikes, analog is so simple in comparison.
Aural Robert.
... PLAY LOUD ...