It was really simple, the most time consuming part really is just laying all the leaves out. I put the oven on the "warm" setting and once it is preheated let it set on warm for 20 mins. Then turned the oven off and placed the baking sheet with the lemon balm in it and closed it until morning.
The next day the lemon balm was perfectly dried and ready to be stored.
I have left some in the whole leaf form in a ziplock container for now and some batches I have "mulched" up and put in lovely repurposed containers to distribute to friends. The dried leaves can be used like tea, as a spice in cooking or used in balms.