Set a timer so you know when to change positions
I sticky tape a picture of the 4 positions on the wall. I sit the lady down and i point out the particulars of each position, and then we synchronize our phones to know when to switch.
Lol.
In reality, I tend to start w her in CG 100% of the time, and 99% of the time end in doggy. There may be 1 or 2 others thrown in. Usually I want to keep my powder dry for the doggy finish, so if I feel the launch sequence approach I'll switch position to hold it back.
I start in CG because I think it's easier for her to control the insertion and to get comfortable with me and mine.
Then sometimes the side, with her on her back, as I can watch her boobs sway and or if shes a clit stimulator she can get at it very easy, then Mish, and try to position at some point with her legs up so she can see the dick going in and out (a couple of ladies seem to like that). Then turn her around for the doggy finish as seeing her bum in that position, along with some side boob, will for sure initiate the launch. At this age I can hold out a lot longer than me in my uni days, where I could not make it to 10 pumps before blowing on the first go lol. Tried then to make up for lack of quality w quantity, ie, at least 3 shots in the hour, the number of pumps doubling with each sog (from 10 to 20 to 40 lol).
If it's a new lady maybe one more switch just to see how she fits and feels and looks. Also let's me get a feel for which one she responds to. With a longer time reg might try a standing doggy or something else, but not much more than this.
Ps - I'm talking for at least a 1 hour booking, usually 90 mins. I only once ever booked a 30 min and would not ever do it again.