I do what MrsFlynn suggested all the time and would recommend the same thing myself. I hate the default placements of lots, especially expansion lots, in many towns, and it's a huge time-saver to be able to go into an already modified base town to start fresh.
One tip I would add is to put the rabbit hole buildings with careers on an empty lot before you demolish anything. (Moveobjects cheat will allow you to fit them all, and it will only be there temporarily so there's no need to worry about sims being able to path to it.) Otherwise, if you demolish a rabbit hole building, any sims in town who had an established career (generally, sims that would be your sims' bosses and co-workers when joining specific careers) in it will be reverted to unemployed and randomly assigned wherever. But if you have those, the career statuses won't be harmed if you delete and move places like city hall, the police station, and such. Then, when all the lots are how you like them, you can delete your temporary rabbit hole lot and put whatever you want there.
That said, it's not necessary, especially if you don't care about households you won't be playing, but for me it's just personal preference.