I agree with your friend - the land and business change form is a right royal PITA!!
However, perhaps you can assure her that it doesn't actually entail a change in itself, it's just the standard form. Like Anke says, why not download the form yourself and have a go at it? We were in a similar situation a few months ago, so I just put N/A in the boxes which weren't relevant (i.e. most of them!), and wrote a covering letter with it explaing what I ACTUALLY wanted to do, as well as a map with the relevant piece of land highlighted. Anyhow, they accepted it in Perth no problem, and this was for a very similar situation to yourself.
HTH!