I would listen to your Pro. you can change latter when you know how to hit the ball.
2/3 irons are rare. note that a 3 iron today has yesterdays 2 iron loft. playing a 2 iron is having a 3 iron in the bag.
- 2 irons are replaced by 5 woods or 3 hybrides. it's a 18-19° loft.
- 3 irons are after replaced by a 4 hybride. 21-22°
4 irons are still in use pretty often but few players hit it well enough to say it's a true 4 iron shot. about 24°.
hybrides and woods are easier for lower swing speeds. they also give the higher ball flight needed on modern courses that pitch less, roll more and have more frontal hazards.
This ai'nt the 80s anymore. Player that carry a 2 iron around here just do it for the show and it get's very ugly when out of the bag.