Hey All I Got my Motor Back half hour ago! After 7 hours of working on it to find that my Clutch had completely Seized to the engine had to Plasma Cut it off

(The Garage Asked me in to do it as im qualified) They took 50 quid off the labour
Anyway how easy is it to repair a Driveshaft seal which has come lose on the Punto an as a result has been leaking gear box oil when the engine is warm??
Many thanks!