I went back to work when baby was 3 weeks, and I bf him until he was 2 - so can safely say it went well. Totally possible. Employers have a duty legally to give you somewhere to pump.
I pumped in a quiet room without a lock. Only got walked in on once...!
I fed baby expressed milk from about one week old to ensure he would know what to do with a bottle.
I used a medela pump in style was about £250. Not sure if I'd buy the same one again - do some research on open vs closed systems. Medela is open and pumps air straight from surrounding environment,in my case dusty stationary room - not good. Mind you, I'm a sucker for the look of all their bottles etc. We bought the entire kit inc. Bottle warmer and skme other tat we didn't really need - we just wanted to get it right.
As for pumping, I got into work early and pumped before I started. Then again at lunch, and occasionally in the afternoon if the day was running on a bit.
I took hundreds of videos of my boy bf and watched them to help with letdown.
As soon as I got home I would put new milk in fridge (had a freezer pack to keep cool at work), ice pack in freezer and wash and sterilise all bottles used that day. TheN pack them back in bag ready for next day.
It was really tough. Got major oversupply on weekends and had to pump then, but did need milk for mondays so that was ok. My milk was just so forceful as the pump stimulates you a lot more, so my boy was engulfed by milk quite a lot.
By the age of about 4/5 months he had had enough. He stopped taking a bottle altogether and waited the 7 hours for me to get home from work, then fed like a demon all night long.
I am very pleased we managed to do so well, but please don't be hard on yourself if your body doesn't cooperate. Lots of women find the pump impossible, and that's fine, but it might be best to see if you can get a cheap pump to try and then quickly pop out and get a proper one if it suits you.
Any q's just pm me!