Practicing taping your hands before the cert and working with the bell in snatches in particular is also a Good Idea.
many folks never use tape in their regular kb lives. The cert can be a different animal.
If a blister happens, if it opens at the cert, there's not really an option to stop, so a kind team assistant or TL may have tape available. So it's a good idea to have a taping pattern that works, and be comfortable with the feel of swinging and snatching with tape.
Recommended taping - Rif used to have a page up on gymnastic style taping for the rkc. Sadly it's no longer available, but Britt B kindly
pointed to a similar resource lately of a vid on taping.
A couple notes on that vid:
1) from practice, you'll find that you want to make SURE the area right under the fingers has as little to no gap as possible since that's where blisters can happen
2) you may want to bend your hand up a bit when taping rather than keeping it totally flat, as the tape can bunch up in snatching if it's not on pretty taut.
3) as shown, the main taping is reusable in this style, and that's a plus.
You may not need/want to tape your hands during the cert; you may only feel one going; by day three you may be down to both needing it.
To get a sense of this, take a look at the vids from the 2008 denmark cert - look at the hands and see how many are taped. They didn't start the cert that way.
You'll also note that some folks just wrapped across their hands - the gym taping version is MUCH better, longer lasting and effective for the duration.
No tape is great and ideal; knowing how to tape for that possibility is pretty good though too.
best
mc