This can be a "DIY" job for sure. Look up the e-bay seller "Interslice" he sells camera seal replacement kits for around $10 US. Comes with great instructions ! I have done at least three cameras with each kit. This will cost you 5 X that to have it done.
RF's : Bessa-R, Kiev 4AM ,FED II, Yashica Lynx 14,Yashica GT, Yashica Lynx 5000 , Olympus XA, Argus C-3
Other :Minolta XD-11, Yashica FX3 super2000, Yashica-Mat 124G, Rolleicord Va
Digital :Nikon D50, Canon A620, Panasonic FZ1v2