The next best thing is read some screenplays. Not for prose, but for the way they write scenes after scenes of "show, not tell" and yet still convey the emotions, thoughts, etc. of the character clearly.
The Green Mile is a good one to start, so is The Talented Mr. Ripley. But really, just pick up any award-winning screenplay and study.
Good tip. Where can I find such a screenplay? Besides illegally downloading one (which I refuse to do) I have no idea where to find one.
This isn't my best example of writing but I hope this can help clarify the "show not tell" problem.
**Corban brushed past Elsa with a swagger. He turned the knob then hesitated with his head cocked to the side like a pup.
"Move," Elsa said and wedged herself between him and the door.
Corban sniffed the air hesitantly and stepped backwards until the window stopped him. Elsa nodded her head towards the blue Vicks container he held in his hand. After a moment she shrugged her shoulders and opened the door with a wide swing.
Corban covered his nose with the back of his hand as he looked away. He widened his eyes blinking furiously and then squeezed them shut to let the tears wash the sting away.
Elsa smacked a glove against her wrist and cleared her throat. "Ready?" she asked.**
This has plenty of show in it. If you had to judge based on this alone what would you say is happening? what do you know about the two characters?
**Like all rookies, Corban thought he had this down pat. Elsa might have been an old pro, but he wasn't going to let her show him up on their first case together. As he approached the door he caught a whiff of what lay behind it. The stench made him second-guess his cockiness.
"Move," Elsa said with authority.
Corban went as far back as he could before the window stopped him. Elsa was looking at his hand and he knew she wanted him to use the Vicks under his nose to cover the smell, but he was too macho for that nonsense. Elsa shrugged her shoulders as if to say oh, well, your decision
. She opened the door confidently and without hesitation.
Corban looked away as the foul odor permeated the room. He felt sickened by it and tried to cover his nose to keep from throwing up. He squeezed his eyes shut as the smell was strong enough to make his eyes sting.
Having done this a hundred times before, Elsa put her gloves on and prepared to get her hands dirty. "Ready?" she asked, knowing the only way for Corban to be successful as a crime scene investigator . . .**
This had plenty of tell. I'm telling you Corban's a rookie, Elsa's a pro, there's a dead "something" behind the door, it stinks, Corban's a little full of himself, he's also unsure, blah blah.
Think of it like painting a picture without the little "thought bubble" telling the reader what the character is thinking and why.
Probably a bad example, but think of the Mona Lisa and the infinite possibilities her smile is concealing.
As for the rushing . . . I still haven't figured that one out yet myself. What I do is just rush through some scenes to get to the juicy one's I can't wait to write and then I go back during the rewrite and take my time expanding on those scenes I rushed through. Probably not the best idea though.
Hope this helps.