1. Look at hangboard
2. “I really should do some dedicated hangboarding”
3. Look at really funky problem that’s been bugging me
4. Work on problem until I’m burnt out
5. Look at hangboard again
6. “Damn I’m too tired to hangboard”

There’s tons of resources on YouTube discussing it, check out Hooper’s Beta and Lattice videos on the subject.

My condensed takeaway for you would be something like: absolutely DO start hangboarding, but take it easy to start and build slowly rather than trying for big gains from day one.

Warm up gently, and when you’re getting started, don’t go past what feels like 80% max. Build to 100% over several sessions and only then start pushing your max. Personally I’ve been training about as long as you and I do hangboard, but I have already given myself a minor injury (lumbrical sprain) by going too hard in a relatively untrained grip (3 finger drag) without sufficient warmup.

Another thing you hear is to do your max hang sessions when you’re fresh, and start out with relatively few sessions per week – maybe 2 sessions, on days that you’re feeling good, BEFORE you hit the climbing gym.

Honestly, V4 is a common plateau, but it’s not one where finger strength is the main limiting factor. You’re more likely to make progress by improving your movement and technique.

If this is in the gym, I wouldn’t recommend hangboarding until you’re reliably climbing V6 at least. It’s just probably not going to help much, if at all. If you do decide to do it anyway, rule number 1 is never full crimp on a hangboard. And for a beginner, you’re going to want to find a way to take the some weight off so you’re only hanging at about 50% of your body weight for a couple months.

To agree with other posters here V4 is the first plateau you tend to hit a new climber, then getting to consistent V6; and do not rush into heavy ass hangboarding too soon. Tendons develop much slower than muscle and going too hard too fast will just lead to you hurting yourself and being injured for long periods of time.

Starting with sub max hangs and working into just bodyweight would be good starting goals to supplement your climbing. I tend to follow the advice from Beastmaking in the “little and often” mentality now; I do 2 sessions a week after warming up before climbing that are very short that are up to 6 hangs if I’m feeling very strong, but as little as 3 hangs.

Since I’m working back into V6 after a very long break and I’m a pretty big guy I will do either sets of half crimp and/or 3 finger drag (at bodyweight) with hangs going up to 10 seconds and up to 3 minute rests before my climbing sessions. Depending on how I feel I will cut that down to just one grip type , preferring 3 finger drag.

For someone who hasn’t been climbing for very long I would honestly recommend getting as much milage as you can and doing sub max or “no hang” as supplemental to help build your tendons up.

Just my 2 cents and your mileage may vary and all that.