Just want to check that you know you just need to twist your heel out?
Make sure they're aligned correctly so you don't have the exit point too far out from the frame.
I usually keep the tension fairly loose because I'm cycling in a city and need to clip/unclip frequently. If the tension is too high then it's harder to unclip reliably.
Other than that, just practice! Not unreasonable to practice while on your bike and holding on to a fence or something so you can figure out what method works best for you.