To get the hang of it, and to be able to catch the wheel, I've been starting off the first couple of days with the trolley handle as a support between my legs.
I think it feels really nice to have that support, and believe I've learned much quicker this way than without the handle.
Second day riding ever on a EUC for me I managed a 16km trip, taking quite a lot of turns and small hills. I don't think that would have been possible without the support of the handle
Anyone else did the same way to learn?