In reply to Doug:
> A good shovel & a probe plus the knowledge to use them - a little practice is a good idea even if you've done it before
What Doug says is very important. You should be able to rent shovel and probe with the transceiver. Have you used a transceiver before? If so, you should know the principles behind how to search, how to dig and how to probe. If not, you need to learn these things. This will involve reading up before you go. When you get your receiver, practice with it! They are not all the same and if an emergency situation, the more natural it is, the quicker you can get searching.
Re boots, I'd see how heavy the rental boots are but more importantly, how they fit. You can then decide whether to climb in them or not. How about phoning the sop up and finding out what they have in their rental stock? People do carry boots in and swap, especially for people trying hard stuff, so it's not a mental idea.