I love heels! I don't think I can do without them. Only recently has my boyfriend convinced me to buy a pair of flipflops for more casual wear ^^;; Says he likes putting his chin on my head apparently XD Feel so short...

Anyways, I wear 3inch heels everyday to work. My secret is to choose strappy or open toe shoes. Let those babies breathe o.o-b Also, you will want to keep your toenails nice and short. Trim them well because they do cause pain when pushed up against the insides of your heels what with your whole body weight sliding forward.
When starting out in high heels, choose a pair where the heel is chunkier. Don't go for stilettos just yet. When you can balance in those you can slowly make them skinnier. Just remember, the wider the base the better the balance. Wedges are good but I feel that they don't have as much flexibility when walking so sometimes I end up stomping in them.
Another secret: I'm constantly on my feet in the office walking around alot but when i get a chance to sit at my desk, OFF comes the shoes! XD Yup, just take them off and flex them on the carpet. Bend your toes backwards and forwards and try to spread your toes on the flat floor. Put them back on only when you are leaving the desk again ^^

I hope this helps a little ^^