There's no real precautions that I can think of, just make sure the engine externally is clean - really clean - and same for your work area. If you have recently replaced the clutch, then clearly you have the tools for removing the flywheel, which is probably the biggest challenge of this job. When removing the 1/4" screws from the Sump Rails, be sure to get the 2 that are a little hidden behind the Front Engine plate.
When re-assembling, you can get the Engine on to the Gearbox in a much more controlled and square way if you have a lifting aid (Engine Hoist for example) rather than man-handle it. I'm sure you would have, but to be sure it's covered, replace the O Ring on the Oil Feed that's in the Sump Rail of the Gearbox. When you do get the Engine on to the Gearbox, have a good long look at the Half Moon Seal to make sure it is seated as it should be and hasn't pinched up at one end or become dislodged. I'm not sure if you had it in mind, but I'd suggest replacing the Primary Gear Oil Seal, the Mini Spares type;-
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I've found to be quite good. The later Injection Seals do work better but they also seem to wear a groove in the Primary Gear. There's a few ways the Transfer Housing can be offered up the the Engine / Gearbox so as to have the Seal seat correctly, I'd suggest (assuming you don't have the tool) winding some tape from the Seal Area on the Primary Gear (only lap on to this by about 2 - 3 mm) over the Splines to the end of them. A light lick of Oil on the tape and the Primary Gear and the Housing should go on easy, then take your tape off checking none is left behind. For this reason, I feel the likes of Electrical Tape is a good choice here.
I think once you do it, you'll see how easy it is.