Well, I'd get it done before it goes tbh dude.
Mine went on 106k miles and the steering was dangerously heavy.
Ended up getting a recon unit for £117 and then fitted for about £150 (inc a £45 new pipe too).
Tbh, if you've ever done an altenator you could probably do the PAS pump.
It won't be easy though. As said, there isn't much room and you have to remove a lot of stuff, but it could be done in a day I'd say; even if it's your first time.