Dude just do it, they're only complicated for a moped. Seriously I over thought it for almost a year then I jumped in and it wasn't too bad.
I'd say with digital calipers and a machinist dial you'd be set.
Read up on shimming.
Get the crank in with new bearings and original shims and use a machinist dial to measure how much the crank moves. If it's in spec then start it without the trans and listen and make sure it sounds ok.
Out of spec? Change the shims.
Another way is to measure the crank with the bearings on and match that width when you get the new bearings on.