As Warren says it depends on a whole lot of factors and everyones situation will be slightly different.
I've given up a really well paid career to go full time so it's a big shock, but my wife has a good job and I have found part time work to fit around uni so we're not doing too bad.
Our biggest outlay is the mortgage and we were lucky to be debt free apart from that.
Because of my wifes salary I got the full grant amount so that helped with the fees.
Apart from that we have just had to look at our finances and cut out wastage and be more careful about what we spend our money on - which is not a bad thing, we wasted so much money before.
I haven't had to take a student loan at the moment, but it's an option for you if you need it.