He might have meant avoiding breaking the injector bosses on the head. Yes that would be a good tip.
Other tips -- work slowly and methodically, take good notes, keep track of what came from where. Otherwise it is simple. The hardest part is resetting the cam and injection timing, and as I recall you have already been through that process before.
We will cross our fingers that everything you see turns out OK. If you saw gross external leakage of water then that probably is not a good sign for the head. You will want to have it checked carefully for warpage. Let us know if you need any help along the way. Good luck!