The installation should be pretty easy, however I would seriously consider what if any advantages you are expecting prior to investing the time and money. The anchor locker on the H33 is too shallow according to the specifications required by the windlass manufacturer. That is regardless of witch windlass you choose. Because of the shallow anchor locker, and the slope up to the windlass, the anchor rode will ride right up into the bottom of the windlass and jam as you try to retrieve the rode. Be advised that you will be stopping the windlass every few feet of rode you recover to re-arrange the line in the anchor locker before you can continue]
I know HunterBlows won't agree with me and although I agree that the H33 anchor locker is badly designed it really is not a problem giving the chain a bit of a hand when retreiving the anchor. It is certainly preferable to trying to drag up, in my case 70 m of chain, by hand in 25 knots plus. I had manual windlass on my previous RL34 and retrieving the anchor was the nearest I ever got to having a heart attack
. I vowed never to buy a boat again without one. The trick on the H33 is to get down onto your knees press the button with your right hand and hold the winch handle provided, with your left hand and hook it under the chain every few metres and chuck the chain down into the bottom of the locker. When you have mastered the technique you don't even need to stop the windlass. Bit of a pain but the H33 has a number of compromises in order to maximise the space inside such a relatively small length vessell. It still is very good value for money and can mostly outsail its competitors.
PS You might find that the wiring for the windlass is already in place as standard. I asked this question when I was buying in 2004 and they said it was. I subsequently ordered the factory installed version so could not verify.