Western/English Differences... and Training Western Horse?

I am currently riding English, but when I go back to the States in one year, and buy a horse, the horse will most likely be trained for Western Riding (that's almost all that they do in Texas... :P). I just had a couple questions:

What are some BIG differences between English and Western (besides long reins and big saddles)?

How difficult is it to train a Western Horse to English style?

What is the most difficult thing about Western Riding to get down if you come from English?

No need to HURRY into an answer... but it'd be nice to know. ;)

It depends on if you get a ranch horse or a western pleasure horse... depends on what type of western horse you are talking about... but going from western to english is not that hard... english to western is harder....

Heh... oh dear. :P

I rode "western" (it was half english half western) earlier this year... and... well... I must say that I made a complete fool of myself.

I am unsure as to which kind. The horses that are at my Uncle's are all ranch horses. But the one I'll most likely be getting will be pleasure or trail. (though... I might get a ranch horse to round up my granddaddy's cattle... HEY... there's a thought... :P)