Pikachuuuuuu...

Anyhoo, congrats on your lucid success! The things that you mention aren't actually as "basic" as you may think... a lot of people have trouble with those. I think there's a big thread somewhere all about summoning people... try using the search function and search by thread title, and just type in "summoning." A good technique is to expect to see someone behind a door, and then hopefully that person will be there when the door is opened.

As for changing location... my favorite technique is going through a mirror. Otherwise, you can try thinking of a new location while spinning.