Yikes, you have a full plate! But gosh, it's going to be beautiful!!
I know I can easily get overwhelmed if I have to look at the entire project all at once, then I don't even know where to start. It helps me to work on one project (one bed?) at a time. Only take those plants for that particular bed out of the greenhouse. The rest can hang out in the greenhouse a couple more days. When you get done (or almost done) with the first bed, move on to the next one.
I had a boss once who used to say, "How do you eat an elephant? One bite at a time."
