Welcome to the club.

You will notice on the iwasaki there is a point on the convex side of the razor just aft of the blade which is flattened and polished. Thats a finger guide, as I recall your index finger is supposed to rest there though I've experimented with my thumb also.

Once you get more familiar with the blade you will realize the concave side should be against your face at all times. Its easier the other way and it does work but personally I find it doesn't feel right.