I would add using a handheld magnifying glass. radio Shack sells one for cheap.  I check every solder joint, and would have missed a few cold solder joints without it.

2550 Kit Newbie Here,
Hi all,  Although I have built and designed various stomp box kits that work well, this is my first tube amp kit.  I have a BS Electronic Engineering but haven't used it for 20 years. I was a bit dismayed with the lack of documentation that came with the kit. What I have found is a one-page overview layout. Other kits I've assembled included some nice build photos, voltage test points, basic instructions, schematics.  Is there any more detail that any of you guys have come across that would be of help?  Thanks much,  GK