I breastfed my son (who's now 3) for a year, the first few weeks are very hard and tiring on the mum and i found i had alot of backache and i only got about 4 hours sleep at night! I tried expressing but for me, i found that it hurt and the result was only a few ounces plus my son did'nt want a teat of any kind or even dummy, believe me i tried all...
I did'nt have a supportive partner and i know this is an important factor, if your wife could express, ( most women do and have no problems), then you could give the baby his feed and she could rest, i doubt he will reject the breast after, i wished my son had gone onto bottles earlier.
I did'nt want to scare you or sound pessamistic, it does get better.
I'm pregnant with my second at the moment and am in 2 minds whether to breastfeed this time around! lol.
Wish you both the best of luck, let us know how you get on.