I can't add anything super useful about rifle shooting - I'm still new to this whole game, myself, and there's a lot of good stuff here. Thank you for starting the thread,
@morganlamprecht - it's so easy to get locked up in the gear that you miss the point.
One thing I'll add that I still haven't done myself (because of a move, etc), but that seems pretty critical for dry fire and range practice, is a simple, small practice barricade. I have a device I built from
@Diver160651 post here that attaches to my tripod. I use that consistently, but I can see where it would help to have a real barricade, too.
Pressure/nerves... I spent 20+ years shooting USPSA/IPSC at a reasonably high level, and learned a few things there about dealing with match pressure and jitters.
#1 is this... those jitters are a result of adrenaline, and you get adrenaline in this case because your mind and body are anticipating action. You can look at that as a bad thing - I prefer to think of it as my mind is telling my body that we're about to do something really cool. I can take that energy, and sink it into worrying about the nerves, or other negative ends, but those things just make the situation worse. Instead... I use the energy toward positive ends - I double down on my efforts for stage prep (visualization, double checking gear), and then I simply breathe. Forcing yourself to breathe slowly and deeply will help in two ways - it takes oxygen to metabolize adrenaline, and it helps with a sympathetic nervous system response to settle things down neurologically. To summarize, you're about to do cool shit - that should make you smile - just breathe deep and slow, and recheck that you've done the work you need to do to be ready for the stage.
#2 - practice with pressure.
@LH_Gina - your trick of having a training partner design a stage and surprise you with it is really good, and great for practicing shooting a full stage at a match. Another way to add pressure in practice is to dry fire and live fire practice with a timer using par times. Pick any drill - let's say start standing, and at the beep go prone and fire two shots at a 2 MOA target. Do that drill focusing on 100% correct execution and avoiding rushing, and figure out a rough time. Now, set your timer to that time plus, say, 5 seconds and set that as a par time on your timer. Now you'll get a second beep at that time. You will likely feel a little adrenaline, but if you established a reasonable par time, you should make it, no problem. Shoot it a couple times that way. Now knock a second or two off your par, and repeat. Continue that way until you start rushing to make the par and the wheels fall off, then back off a bit and shoot it once more at the fastest par you can manage and still shoot correctly. Write that time down, and make that your initial time for the next practice session (you add some interval to that new time to start the drill).
#3 - use the local matches to get used to big match pressure. Pick a buddy, and place a bet on the match. Say, loser buys lunch. If you're equal skill level and shooting the same division, shoot heads-up. If not - let's say I were to play this game with Morgan or Gina - establish a handicap that seems appropriate (so, maybe I get 30% or 40% of match points available or of their score, or whatever). The first couple of times, the handicap might be inappropriate, but you'll figure out what works pretty quickly. Just that little bit of awareness of your competition will provide a different kind of pressure, and it's something I used to feel at big matches. Playing this "side bet" game made a big difference for me in taking pressure off at big matches. You could also play for "fewest fired misses" (timed out shots don't count for the game), or whatever part of the game you want to highlight that way. We used to play it at national level matches for fewest misses, no-shoots, and D-zone hits and we'd establish a buy-in and pot - and it applied equally that way to all shooter skill levels. It was a lot of fun, and provided a really nice learning tool for mental toughness.
Honestly, at this point, I get worried if I don't feel the jitters before a match - usually I have a flat, dull performance.