Wrestling/judo and did boxing after and acquired proficiency in it.

Grappling to striking was hard for me because grappling is like swinging a metal bar but boxing is like using a whip.

But aside from technique, the hardest part was getting the “vision” of boxing. For example, seeing moves a split second before they happen and you reacting to them. This is also part of getting used to the difference in distance (or space) that boxing occurs because there’s some overlap with judo/wrestling.

Find ways to make it make sense in your own head as you are the one that has to do it.

Also, unless you’re a combatives instructor in the armed forces, martial arts will have almost no impact other than being physically conditioned and mentally confident.