Hill Climb Training

Just ride up it,

Ride up at TT effort if you want to do it as quickly as you can (like a TT - don't go out too hard or you will pay for it later).
Practice by riding at a constant effort that is as hard as you can ride for 1-2hrs (doesn't need to be uphill, so long as your effort is constant)
Otherwise just keep turning the pedals till you get to the top.

Most Alpine/Pyrenean cols are fine as they are generally not that steep, they just take a while.
Hell my other half rode up Alp D'Huez whilst 3-months pregnant, just kept going till she got to the top (I rode up* towing our 18month old in a trailer)

*yes I know I am scrawny, but #1 son + trailer is an extra 30kg

Alp D'Huez - September 2013 by Dan Burbridge, on Flickr

SImply awesome, what a view. That must have been a great day.