Congrats!
I just received my HRM 50 about a week ago. Been building steadily. But my time is somewhat limited and I also want to take my time since this is my first amp build. So far everything is going well.
The main screws and nuts are M3x12 & M3X6 w/M3 nuts and star washers. These are small and can be a little hard to deal with in some areas. A nut driver for these would be helpful. Then there are connections for the pots, jack, and switches. As far as the transformers, I'm not sure if yours will be the same, but there's not much to that anyway.
You're gonna love the kit. I know a did.