I had a similar problem hooking up with an instructor last summer. I ended up getting only 2 "instructor" flights before finding a club member that was willing to help me. He only had a year of experience but that was more than enough to get my trainer up and down safely. I drove him nuts for two weeks and concentrated on landings (at my insistence) on every flight. By flight #9 I was competent enough to go solo, and I since put at least 100 flights on that plane without a real crash.

I think the key to fast learning is to concentrate on landing practice! The approach in the response by Kevlar above is exactly the one I used. Each training flight consisted of almost nothing but landing passes, and each time I had everything lined up right I set the plane down, taxied back and took off again. My "stand-in instructor" took control on a few poor approaches during the first couple of flights, but after that he just held the button and watched, just in case...

If you already landed it twice by yourself without problems you are not far from being there!