Are you going to romove the heads to do the springs and retainers or are you going to use compressed air to hold the valves in place while you cange the spring? there is an old method of using 1/4 in nylon rope by feeding it into the cylinder through the spark plug hole and then MANUALLY bringing that cylinder up to top against the rope so the rope is sandwiched between the piston and the combustion chamber and the valves holding them in place (you can turn the engine by hand if all the plugs are removed) while you use a valve spring comressor to remove the old and install the new springs then MANUALLY back the piston off from the rope allowing you to remove the rope then you can move on to the next cylinder repeating the forementioned process. As for tools 1, valve spring compressors use Lisle Part#59550, 2, 10mm sockets deep and a shallow, 3, 13mm socket deep well, 4, 3in. and 6in. 3/8 dr. extensions, 5, 3/8in dr. & 1/4in dr. ratchet, 6, 4in. 1/4 in. dr. extension, 7, 8mm 1/4 dr. socket, 8, 15mm socket and wrench, 9, inch lb torque wrench, 10, 5/8 spark plug socket (deep well), I might be missing a few things but I'm tired. If you have never attempted anything like this before you should at least have a little mechancal knowledge or you shouldn't do it. I'm not sure of the torque specs right off hand, just get a manual it's all there. Good luck!