Hi Steff,
I've recently been using Sailor's "pressing in the pot" suggestion. Basically, after filling the mold with the curds, put the mold in a pot and put the pot in a sink of hot water. The hot water bath warms up the pot, keeping the curds warm. I use the same pot I used to make the cheese, since I've drained the whey into a different one. And, I keep that pot in the warm sink while filling the mold (the milled curds are in it, so it keeps the curds warm as well as keeping the pot warm. Then, do the first press with the mold in the pot that is sitting in the hot water. Cover the pot, and you should have a nice warm environment which aids the knitting of the curds. I've done this for a few cheeses now and it really seems to help.
I think caerphilly is a fairly forgiving cheese. I over salted the first make, and it was still good, and darius over salted his first make and cut it early, and his has turned out good too. Keep an eye on it and it should turn out just fine. Regardless, don't forget to post your tasting notes when you try it!
- Jeff