Sequence of operations is always interesting to me. I try to do things differently sometimes to see if everything still goes together OK.
However, I do things as many others have said:
Taylor: I always inlet the tang after the barrel is in it's channel, though I don't install the lugs or loops, nor the pins or keys.
At this point, I get the profile at the top of the tang and wrist close to what I want. Bend the tang if needed, inlet a little deeper if needed, rasp the wood down to the tang. Look hard at the profile and make sure it's what I want.
Gary: I inlet the tang and go ahead and drill it for the tang bolt. That way I can fasten it down with a short, fat woodscrew while I'm working on inletting and stock shaping. Replace the screw later with a bolt to the trigger plate if so desired.
Then I am ready to place the lock. I lightly punch the touch hole location. This fixes the lock location fore and aft, up and down. Around the punch mark I can rotate the lock slightly to accommodate the profile of the wrist, and/or to make room for the front lockbolt.
Once my lock is set, I can shape the lower profile. Now is the time for me to inlet the trigger plate and run the tang bolt into it. I also put the lock bolts in now. This paves the way for the sideplate install and the side panel shaping.
Now I know the pull, approximately, and can set the buttplate.
I leave the trigger undone until the shaping is well under way. The guard comes later, too. I want to develop the form completely before installing the guard.
Now the forestock needs attention, so before I start hauling the wood off, I like to put the tenons and pins in. I rough shape the forestock, then I install the entry pipe. The pipe configuration and placement dictates the shape of the forearm between the lock and the pipe.
Then I work the stock all over several times, removing wood from the wrist, back to the forearm, working the lock panel area over, back to the buttstock, and to the wrist again. One area affects another, and a balance must be attained by gradual shaping and looking. (Unless you are Mike Brooks)