help people! 316 alternator belt replacement

[emlclcy]

last night one of the strands of the alternator / utilities belt snapped so i'm just about to pick another belt up (£28 not bad from pentagon) but have never replaced one before and i need my van on the road.
any tips? radiator out etc?

thanks
carl

 

[television]

Its straight forward to do, just slacken off the tensioner, do you know how it goes on