Sisco has pretty much got it there (re 100 and 101 .. and also IIRC this will suit Redhawk the same) but .. to add.
Once grips off .. pull hammer back enough to let the mainspring guide progress downwards until the small hole appears .. put the pin supplied in the grips thru that ... or a suitable finish nail etc. This will keep the spring under tension and restrained.
Remove the hammer pivot (cross) pin .... by pulling it out from the right side, where the flat piece shows. You can then remove hammer and spring assembly.
As mentioned, the trigger group will come out by withdrawing downwards and forwards. This is perhaps the trickiest stage. Crane assembly should then be removeable.
Main point I would mention here is ... be aware of the cylinder bolt and hand, and transfer bar etc ... they can come out and two have small compression springs operating on them. Best is to avoid these parts coming out of the trigger group .... but anyways do watch for the small springs.
Reassembly is the reverse process but ... again be aware of all the parts ... and offer the trigger group back up carefully. Jiggle - do not force.
I think I am about right, but to be honest .. only ever really see this clearly - when I actually do it .. one of those things that comes easy to do but not so easy to remember for description.
If in doubt, try and find someone who IS familiar and get them to run thru it for you .... after one run you'll be set to go solo!