I've got a leaky seal on one of the back windows on my VW T25 bus, anyone know if it's an easy DIY job to replace and if so any ideas where I can find a video or step by step guide?

It involves a length of rope, I've watched it being done and thought "That looks simple enough" and then though "I've no idea what i've just seen"

Discussed here but can't find a video

Where u based ???
It's my trade!!

Tricky the first time you do it but very easy thereafter.
Use "parachute " cord as it wont snap and it is about 5-6mm dia.
A wee bit of hand soap ,non grit type, helps as does an assistant to hold glass in firmly.Overlap string at bottom usually and get two corners inserted at side of overlap and start there.
Take your time and it is a easy job.

Based in East end of Kent so miles from most of the population of England, but if anyone can reccomend a local fitter that would be good.