Hi Porg,
The advice I'd give is practise your bouyancy!
- Practice in the rig you'll dive in beforehand concentrating on buoyancy control. Do a mask clear and see if you change depth. Do a full mask removal and replace and see what happens.
Myself and Rick have tried spending a couple of minutes just relaxing at the start of the dive and settling the bouyancy while hovering over a platform before we started skills. You're much more in tune then - gradually we're spending less time getting it dialed in at the start of the dive.
- Make sure you try your bouyancy while stationary in the right position (i.e knees bent fins parallel to surface, body horizontal). Finning can cover up bad bouyancy.
If you've got that sorted and are hovering horizontally in the water and are basically comfortable the rest isn't too bad.
Everyone's kind of mentioned everything else I can think of.
It's well worth doing fundy's even if you don't feel ready - it points you in the right direction and then you can start practising everything in the "correct" way
Cheers
Al