Lots of good thoughts here (e.g. that it's not strictly about round count), so as a newb to competition, I'll add my reflections on this, my first year of competition. In short, I'm not able to shoot as much as I'd like, or likely need to, so I have to make the best use of my time.
1. On dry-fire: There's a lot to think about once the buzzer goes off. A good, quick sight picture, and quick sight picture to the next target, and smooth reloads are skills that can't be ignored, but with all the other stuff going on, you simply can't also be thinking of this stuff - it has to be hard-wired and done automatically, and dry-fire practice helps you get there.
I found Steve Anderson's book
Refinement and Repetition is a good place to start, but there are plenty of dry fire programs and drills. Ben Stoeger's 15-minute program seems a good start as well. I try to get in 30-40 minutes (preferably twice) per day. I feel I'm largely wasting my time if I go to the range without having done my daily dry-fire work.
2. On live-fire: I've been going to an indoor range, where I have to stand in a stall. Fortunately, I'm allowed to draw, rapid fire and reload, but it's not the same as being able to actually shoot some actual course of fire. I've found I'm really struggling at matches because it's not what I've been practicing with live fire. As such, I'll be going to an outdoor range where I practice more match-like techniques.
At the range, I've been shooting about 200 rounds of .22LR and 100 of centerfire once per week. I use the .22 to work on my draw and first shot on target, and transitions. I don't use it where I'd have to recover from recoil and make another shot, such as double taps, Bill Drills, etc.
Ideally, I'd shoot more CF, but I'm willing to first go to an outdoor range to shoot more efficiently.
I also shoot a bit for accuracy (i.e. groups shooting, or participating in an on-line postal match (see link)) at every session. There's always time and need, it seems, to work on the fundamentals.
http://postalmatch.blogspot.com/
3. On match pressure: Like many newbies, I suffer from Buzzer Brain. It's discouraging as Hell to work so hard during the week, then have it seemingly all fall apart when the buzzer goes off. But, it's part of the learning curve, and I've found it more productive to look at what I did right rather than wrong. For instance, yesterday, I figured out, all on my own, the best way to shoot a number of the stages. Sure, I had some oopsies (a 15 second one, by shooting a single target twice while ignoring the 2nd), but OTOH, I'm slowly starting to be able to read the courses better. Once the course it read, I have a plan, then I mentally rehearse the plan and try to stick to it when the buzzer goes off.
The solution to match pressure and Buzzer Brain, I suppose, is to have realistic goals*, be patient with ones self and, of course, shoot more matches. Due to personal and professional obligations, though, I can only manage 2 matches per month, which makes proper dry-fire and live-fire even more important.
One thing I've noted that seems to simulate match pressure is videoing yourself, especially if you know you
will post it online. Try videoing yourself doing a dry fire drill, and tell yourself that no matter what, it'll get posted on youtube. Or maybe better, post it on the Brian Enos sight and ask for feedback. There's a subforum just for that (see link).
http://www.brianenos.com/forums/index.php?showforum=142
4. On realistic goals: Goals should be specific. There seems to be nothing wrong with having, as a goal to be semi-competitive by next year, but what exactly does that mean and how do you get there? Better goals might be to watch the front sight for each shot, to reload smoothly, to have a plan for each stage, to stick to the plan, to avoid procedurals, etc. I imagine doing these things well will get one their win eventually.
Goals are not fantasy: For example, a goal of hanging with the local 5-gun master at the next match isn't a goal - it's a fantasy - because it requires a skill set one currently doesn't have. Be sure to know the difference so you can set realistic goals.