Putting has three aspects
1. Reading the correct line
2. Starting the ball on your target line
3. Controlling the speed
The first I recommend finding an Aimpoint Express class. The second, start hitting putts down the length of a yard stick. If you can keep the ball on the yard stick for it's entire length then you are starting the ball on the line. The third, try making the back stroke as long as the forward stroke. This could also be a putter issue. An putter not fitted for you can cause distance control issues.
Compared to improving the full swing, and the amount of time needed, putting is very easy to learn.
Match 2 opening hole becomes a pitch-off. Dan sticks it to tap-in distance.
Match 3 opening hole. Blue discusses options on this downhill lie (photo doesn’t do it justice).
Phil had just put Red on green to about 10ft from nearly same yardage as his eagle hole out yesterday on this hole.
If you are an 8 handicap then I would stick with a more player iron. You can find irons that are a mix of both as well.
I believe that a player iron will product a tighter dispersion because a game improvement iron has hot spots which can produce the occasional shot that goes way further than you think it would. Even though a player iron might be a bit less forgiving on off-center hits. Being an 8-handicap your strike should be good enough to benefit from having more consistent ball flight numbers.