Hi JBG and welcome.
Although both benzos, and being in the same class of drugs...Xanax has a quicker onset than the Klonopin, with the Klono boasting a longer half-life...
So you are basicially dealing with more of a timing issue here then one of weaning or withdrawl.
Of course, with any change of Rx's there are going to be adjustment issues.
Following your doctor's instructions should make for a safe transition.
We also have this link from our Resources (along with other great self-help suggestions/materials) where you may find some helpful information.
On-line drug weaning information: (to be used in conjunction with, not substitution for your doctor's instructions)
http://www.theroadback.org/
Good luck with your switch....and post anytime for anxiety support.
Scaredy Cat