The only tool necessary to dismantle the P14 Enfield bolt is a loop of string, which you hook onto the cocking-piece. Raise it, and you can hold it slightly back and unscrew.
I didn't have anything against cock-on-closing, which if anything cushions the wrist against jarring, but I wanted the Dayton-Traister speelock, which just happens to end up cock-on-opening, and their single-stage trigger. Even with the stronger spring supplied, it needs to lift the cocking-piece quite a bit more than to the notch on the rear of the bolt which prevents a slamfire on the unaltered version, if something interferes with sear engagement. So you have to deepen the camming notch in the bolt (Dremel tool with carbide burr), and fit the new cocking-piece with a longer forward extension which engages with it.
A complication I found was that the safety (one of the best on any firearm, and far too good to replace with a trigger safety) would no longer engage in the little hook-shaped notch in the new cocking-piece. So I removed a tiny amount of metal from the lip of that notch, with the Dremel and a fine dental burr. I ended up engaging or disengaging in complete silence, which it didn't before, and still lifting the cocking-piece the very slight amount that is essential for safety.
If the safety doesn't lift the cocking-piece, and you pull the trigger while the rifle is on safe, there may not be room for the sear to rise back into place when it is released. The rifle becomes an accident ready to happen when the safety is disengaged. Of course we would never point the rifle in an unsafe direction as we did that... would we? But two steps away from disaster are better than one.