If you can't see your way point when you expect, consider the possibility that you've flown right over it
Maybe even just about to fly over it. I found, more than one, turning point that had been under the engine. Having looked up just a fraction too late as they slipped under the spinner, I was searching both sides whilst they were underneath.
I also had an issue with an airfield which positioned itself on the wrong side of me, and despite lowering a wing and looking, I just couldn't see it. To save the day, my instructor pointed out that he had one on his side and we could use that as a turning point.
Enjoy the day. and let us know how you get on.
As for planning, assuming you use laminated maps, try this combo:
Sharpie pens and toilet roll. Seriously, this is even better than Chinagraphs, which I get free. Different colours, cheap n cheerful, available in Tesco. What's not to like?
As long as you give it a few seconds to dry, the lines are ideal.