That certainly sounds like a fun idea, sadly my knowledge of PIC is less than scant! Have you got some sites you can point me to that you recommend please, and specifically PWM projects?
Programming is not an issue, well 20 years since any C - but I'll cope, however any really good novice guides to the world of PIC you can point me to?
This is the programming tool I use. https://www.matrixtsl.com/flowcode/
You can not go wrong. Have a look on the forum. A lot of the self learning projects are directed at Automotive. The basic program is free. From then on you can purchase more advanced capabilities dependant on your needs including CAN capabilities.
As far as the AD595 goes. Just make sure you use quality components and a accurate voltage ref/reg. After that the datasheet tells you everything else you need to know. Add the PIC you can program and add a HD44780 (?) LCD from China and you're good to go.
As far as individual circuits go. I look for a circuit that may contains say a MOSFET that can deliver the current at the speed I need and work from there. But you will run into problems. Such as an coil driver circuit isn't isolated from the PIC well enough it can reboot the PIC. So if you are running a sequence of events it can get frustrating. But that's all down to circuit design.
Read the forum posts and I think you will have second thoughts about buying a PWM generator. It's not all plain sailing and does have it's hurdles but certainly do able.