You need to start adding water as soon as the plaster is done really. You will need to put a sock on the end of the hoses to keep the metal off your new plaster and it also helps filter the water some. Put the hose right on the middle of the main drain. Do NOT turn off the water until the water is up to the middle of the waterline tiles. Fill the spa last if you have one.
As far as start up you can do it on your own. It would take some deep pockets to pay someone to start up the pool due to daily testing. I saw you on the other thread where he is doing his own start up. PM him and ask him about it. He is a nice guy and I bet he would love to help you out!
Kim