You really need to do a refresher course with a professional teacher, but incase you decide to go ahead for the safety of your client here is my advise with warm wax:
Check for contraindications, fill out record card
Wash hands
Test wax temperature on your arm and throw this spatula away
I then make the client bend up the leg of the side I am doing and put it against the side of their knee so to give a good stretch, I also get them to stretch their skin.
e.g on the right hand side of their bikini I get them to put their hand (left) on their bits stretching towards the left and with the other hand (in this case right hand) at the top of their leg pulling down in the direction of their knee .
I cleanse the area with pre wax cleanser then apply talc or a small amount of aftercare oil to the area.
Then I apply the wax downwards in the direction of the hair growth, so you are flattening it onto the skin, small patches at a time. Place the strip on with the top at the top of the section you are waxing,so that the bit without wax is hanging down. I then place one of my hands, not the one I will pull the strip with,to also be stretching the skin along with the client for a better stretch and pull off the strip by the bit with no wax upwards keeping it as close to the skin as possible. Then quickly put the back of my hand on the area I have removed hair from to help with pain relief.
(Throw away the spatula each time if the client has spotting and you need to go near that area more than once.)
When I have finished the first side I apply aftercare lotion/oil to the area and get the client to put that leg down and the other up and repeat the whole process on the other side.
I give the client aftercare advise and write reactions to waxing on the record card if there were any e.g spotting.
I really do not think you should be doing this procedure as you are unsure what you are doing and have only explained so that if you go ahead you have less chance of bruising/burning your client.