I do it by having someone close the trunk on me while I am inside the trunk. This way the person on the outside tells me where it is high or low or misaligned. I make the adjustments slowly from the inside. Just take a flash light and all the tools you need. I found this to be the fastest and easiest way because it's really hard to judge how much to move it in/out/up/down/sideways each time you open the lid when working by yourself. I'm not saying it can't be done that way but it just takes longer.
It's what works best for me.
Treblig
