student loans are nothign to worry about. as TM says it comes out your wages along with tax and NI contributions so you get used to the same bottom line each month.
It only goes up by the rate of interest so is the cheapest loan you will ever get.
They dont take anything till you earn over 15k, then the repayments start quite small. when i first hit 15k it was about £20 a month IIRC
It doesnt count towards a credit rating (although my morgage company did ask, which according to the government they shouldnt :( )
If you never earn enough it gets written off, and there are various other scenarios that get it written off.
Most importantly, nobody is going to break your legs or reposses your house over it! :)
i know the numbers are scary but student loans are not the burden some people make them out to be