Make an extra pin to hold the transfer bar mechanism together for removal (shorter than the original), this same pin can be used to hold the trigger together for re-assembly.
The trigger spring hole can be bored deeper rather than cutting the spring (but not much).
Use your dremmel for polishing only, not for removing metal or you will go too far too fast. Get a good set of stones, I have some that are about the same dimmensions as popscicle sticks that were intended for non-ferrous metals, they come in various grades and work great on triggers.
Do a little and re-assemble, check your pull and do it again and again and again...........
If your shop is a rats nest mess like mine is, disassemble the action in a plastic bag, the hardest spring to find after flying across the room is the one stuck to the bottom of your boot.