Hello Rocko,
I am in the process of cosmetically upgrading a property that is not in the state I live in. It was a bit hard to get my head around how I was going to achieve this, but once I inspected the house and decided on the trades, everything has fallen in to place. In terms of cost, maybe its cost me an extra $2k because I am not there to do some of the minor maintenance/ clean up stuff but I am ok with this. Also, the other trades, ie painter, floor sander, tiler, have whipped through their jobs pretty quickly. The key is good communication between your self and the trades, give all the trades the contact details of who else will be working in your house, and a plan of action and time line that everybody is aware of. Also, a property manager who is also up to speed with your plans really helps too. So far, its been good.
Good luck,
Tegan