i agree with getting a bigger workshop to do it out of peace of mind sort of thing, however, you dont need to have a large business to know what you are doing. I know of a few people that aren't in the trade but know endless amounts about cars etc. Sometimes having a big business doesn't necessarily mean your better but i agree, its best to get a workshop to do it if you dont know anyone in the know.
ive done a few manual conversions and i would imagine its as simple as, spigot bush, slave/master, clutch, flywheel, gearbox, corssmember, tailshaft, interior parts etc...nothing too strenuous.