You just go with your feeling and the vibe and the girl's vibe and see where it leads.
Just go wherever your body takes you.
Trying to copy positions from a sex guide book or website like it's an exercise or a recipe or how to assemble an IKEA flat pack is not the way to go.
It's not a rhythmic gymnastics routine with judges scoring you on degree of difficulty and the precision of your performance.
Just go with the flow. Enjoy!