It’s much easier as you imagine. It always one key and in any layout it works the same. If I need to switch to nums layout I always tap twice. If I hold I switch to chars layout. This is much more intuitive than any key combination
I buy corne and at the same time I switch from query to colemak-hd and learn blind typing as well. First several days it was slow as hell. But I didn’t rush myself. I tried to type with 100% accuracy so my brain is sure where every letter is placed. Humps are very helpful for this. I glue small wood pieces(from toothpick) to the key caps and my brain learn where to move my fingers for every letter. Accuracy is very important for this.