If you want to do some prep work before a build, if one ever gets together, get a small file and a small stone and remove all the rough edges/burrs from your receiver. Test fit your front trunnion to make sure it fits OK, so the that the folded over lips engages the slot on the trunnion without pushing the receiver out and that everything looks ok. I've got all my tools and fixtures in one spot now, gonna build one of my kits tomorrow to make sure my stuff works.
Some tools you might want to bring:
Safety Glasses
Dremel tool with cutoff disks and sanding pads.
Small Rubber or brass mallet
Small ball peen hammer
Punch, about 1/4 inch diameter
5/32 drill bits
2 ea, 3inch C-clamps
6 ea, #8 machine screws and nuts about 3/4 inch long to hold trigger guard tight while riveting