Have you done your QXC yet? I think that will alleviate alot of your fears.
The key to managing your workload once you have your PPL is proper planning. If visiting an airfield you are unfamiliar with,go on their website, read the pooleys, give the tower a phone call and familiarise yourself with their local procedures and joining instructions. Before you set off have in mind which runway they currently have in use and anticipate what join you are likely to be given. Write down all your enroute frequencies. Print out a diagram of their taxiways etc.
I am still a pretty new PPL only got my licence last April but I would still struggle to relate flying to driving a car. Flying requires good planning route/weather/notams, thorough preflight checks and a discipline not to press on / set off unless the weather permits. Driving does not bite you if you neglect any of these in quite the same way.
With regard to PFL's im guessing you have only done a couple of hours. The key really is to practice them frequently to stay current once you have gained your PPL. If you really feel unconfident in this or any other area of flying have a word with your instructor and go out and focus on them. Once you are done with the NAV section of your course, you will return to these to brush up on plus other general handling skills in time for your skills test.
Just like driving, your ppl is a ticket to learn, dont expect to be a flying god as soon as you get your poo coloured wallet. I have learnt a good few lessons since April!! If you feel unconfident have a word with your instructor but once you have done these things once you will realise that none of it is really that hard!
Enjoy the rest of your course!