How easy is it to change the standard dump valve and fit a whoosie type one?

Is it something that needs to be done by a garage or just a spanner and half an hour job? Also is it a fit and forget part or does it need setting up/adjusting after being changed?
My cars a phase2 my00

Cheers

John

 

Mega, depends on your ability with a spanner.

They are two bolts and a jubilee clip, then plug the new one on and forget it.

The best one seems to be the forge units.

Dan

 

I think I can handle that myself!
Thanks m8