Was wondereing if anybody on here had any experience of loft conversions?

Am thinking of getting one but thinking do some off the work myself and paying for some of the work. Want to put in a dormer window and would pay somebody to do this, but fancy doing the actual boarding out and finishing off stuff myself.

ANy thoughts or any ideas of prices for say just a dormer installed, or to hav the whole thing done?

ANy ideas's for a good builder/roofer/carpenter/whatever needed in se london/kent area??

Thanks