No, you have to be a registered farrier to prepare hooves for shoeing but not if you're not going to apply shoes.
I would always use or trim under the supervision of a recognised and experienced barefoot trimmer. It's always worth looking on the barefoot forums too as there's a lot of information and experience on there 
Some of the main trimmers/organisations are:
EPAUK - http://www.epauk.org/
Peter Laidely - http://www.hoofworksaustralia.com/
UKNHCP - http://www.uknhcp.org/
Pete Ramey - http://www.hoofrehab.com/
KC La Pierre - http://www.appliedequinepodiatry.org/
Enlightened Equitation has a good archive of 'barefoot' threads although it isn't so prolific since the trimming organisations set up their own:
http://www.enlightenedequitation.com/ee
,43.0.html
One of the EPAUK trimmers, Richard Vialls, has an excellent site which is well worth reading:
http://www.bodrwyn.org/
Last edited by Bay Mare (03 Dec 2009 11:13:00)
"Before you criticise someone walk a mile in their shoes. That way when you DO criticise them you are a mile away and you have their shoes"