Craig the "How To" orange tab on the right side have some great guides, you could always create a thread for what you are actually going to do and ask for advice or things to look for/avoid when doing the job, there are some very clever guys on here that will help you along if you feel competent enough to do the task and the shout box for instant advice
If you are in doubt, do nowt, and watch a pro do it for the first time, as said I think St Russel is close to you, but from reading other threads he is usually booked up a fair bit ..
If you are willing to travel to Poole you have Daz who will can do this for you, and will show you how quite happily ..
All the best