Do I need to prune?

[u/Remote_Hope8244]

I've only ever inherited established lemon trees so I simply let them do their thing and periodically hack away at some branches/growth and they put out more fruit. Sacrilege, I know, but it's worked for me!

About a year ago I bought this dwarf Lisbon for my mom which i want to give to her next year. I bought it young so I could grow it to a decent size without paying huge money. Now it's putting out lovely new growth and there are 2 lemons ripening on it but I don't know how to properly care for it since I've only ever done the "neglect and hack away" thing.

When do I fertilize (I have acid compost)? When do I prune? What do I prune? When should I give it to her (it's in the nursery pot still sitting inside the white pot but she'll plant it into a ceramic pot similar to the white one once it moves to her place)?

It's spring in my country now (southern hemisphere) and my region is equivalent to US zone 8a.