Hi Catrin,
You go! And you *can* do this, as Crankin said. I don't know if you have a stationary trainer for you bike, but it helped me when the shop put my bike on a trainer and just let me clip in and out a zillion times before I went out on the road.

I have the SPD platform/SPD pedals on my touring bike. One of the issues I have with them, unlike double sided SPDs or my Speedplay Light Action pedals, is that sometimes I have a hard time getting the right side to clip into. It can be a pain to flip the pedal. But I like being able to use regular shoes on occasion and my guess is that it will be helpful for learning. Please check back with how it goes!