Can you find a very quiet stretch of road or parking lot where you can practice? My forum mates here taught me to do that. I call it "bike rodeo" time and head to the quiet park. I am a very slow study when it comes to cycling, and this is my first sport (take up in my mid 40's) so my body's just learning balance & coordination now. Take things at your own speed, you're on nobody's timeline but your own. This is supposed to be fun, and I think if you listen to your inner voice it will say, "hey, it's a good day to try this or start doing that." You'll know you're right by the smile on your face.

When my LBS man found out I was shaky on the clipless thing, he adjusted my cleats so they come out super-easy with the slightest twist. (I use SPD so I can use the same shoes in spin class.) It was more a psychological aid than any thing else - but I felt more secure, so I WAS more secure and smooth in my movements.

Regarding descents, you'll feel like you're cheating less if you keep pedaling. My trainer's pretty insistent on keeping the legs moving on downhills so they stay warm and fluid. I'm just pushing air - no resistance, but I find that I am then more ready for the next hill, which in my neck of the woods, is just a breath or two away.

Relax and enjoy, relax and enjoy, and let your skills build in a natural, organic way. You're doing great!