Its fairly straight forward as described by OP, I have done this many times and is easy for me, so here is a few things to be careful in the sense of not causing extra unwanted damage.
When undoing and refitting the rocker shaft don't undo the bolts one by one completely the tension from the valve springs can......CAN break the shaft.
Start by cracking all bolts/nuts and undo them from outside to the inside two to three turns at a time, when assembling do the same but from inside starting point and work to the outside.
With assembly of the rocker shaft make sure the push rods are in the correct location in the cam followers, that is the part in the block and as the name says follows the cam lobe and make sure the rocker shaft also locates properly in the push rod. This is important as I have seen this done wrong and when the guys try to start the engine they have all sorts of concerns, blowing back into intake, misfiring, and so on.
Other than that, be careful when dismantling the valve spring, the quarters, that is the two small wedge like parts that lock the retainer to the valve stem can fall or get lost easy. I use a magnet to collect them and when assembling I put a dab of grease on the inside of the quarters so they stick to the valve stem and not get lost or move when releasing the the valve spring to take up the tension.
Never mix your parts keep everything to its original position, what I mean is the quarters and valve spring of the first valve stays together and so on.
That is it from my side, maybe somebody would like to add if I missed something.
Cheers John.
