The smallest pointed soldering iron.
The smallest diameter flux cored solder you can get your hands on.
As for crimpers, a fishing tackle store is the go, after spending $100 on electrical crimpers, i found a smaller version, which is all you need after you solder it to give it that final lockin.
Good quality shrink wrap and a gas BBQ lighter to shrink it.
A roll of 2mm red and black wire.
And a fridge full of beer.
There was not anywhere near enough bits in the kit to do my WP install, not even close.
Good luck.