[Koha] Switching to Koha unsupported

Dear all I work in a small healthcare library, based in a general hospital in west London with an expanding user-base and a diminishing budget. We need a replacement for our aging DOS based library management system, but can't afford a commercial solution. Koha seems to fit our purposes, but I would appreciate some idea of how feasible it would be to implement on our own - without using vendors such as PTFS? Two of us staff the library and we both have a reasonable level of IT literacy. We also have a supportive hospital IT department. I would be grateful if anyone could share their experience of setting up and using Koha unsupported. Many thanks for your help. Matthew Ealing Hospital Library