Newbie driver skip loader

Hi there looking for a little bit of advice i am only 23 and passed my class 2 just befor christmas,
I have just brought a daf lf 55 skip loader which need a little bit of work which i am gona carry out while i am waiting on my o licence 1st job was to fit the new gear lever as the old one was really worn out and was hard to drive apprentley a common problem on the daf’s, next on my list is to change the gearbox output seal as it is leaking gearbox oil onto the exhaust :confused: i have brought the seal has anyone on here had this done or done it themselves any help whould be great thanks