This would be my biggest tip to stress too. The first couple times I tried polishing I tried to do it all in one day. It made me exhausted, which made me rush, which made me get crappy results. I didn't really learn anything because I just wanted to move on to the next panel so I could be "finished". I hated the whole process. Do a little bit at a time and stop when you feel like it. If something is frustrating you come back to it later.
Also, this might seem obvious, but make sure you have all the tools/products that you need first. It's frustrating to be in the middle of a project and realize you don't have the right tool for the job. Have enough pads, and all the different kinds you might need.
In the past, I had one 6" polisher, some correcting pads, and some waxing pads. It was better than nothing, but I wasn't happy with the fact that I had to compromise in certain areas because the pads were too big, or they weren't aggressive enough to achieve the results I wanted.
I recently got both the SK and SK Mini and 2 of every type of pad. I put it off for a while but finally bit the bullet and so far I really think it was worth it. I started a full multi stage correction last weekend and the combo of having all the tools I need plus spending all the time I need is resulting in me actually enjoying polishing and the process.