How badly have I fucked up. Bought irons coach said they aren’t right for me

I have a golf coach that iv seen 3 times and he’s helped me massively , completely unable to use driver until today’s tips. We got on to my irons of which iv just bought the steel Wilson dynapowers .

I have the lie angle all wrong because obviously I’m not confident enough for a fitting but he’s said to solve my hook issue I now have using these I either have to fully extend my elbows and swing a bit weird (picture Brysons swing locked arms style but with a less athletic fatter man)

When I hit these things they are great I can some what compensate for it and it’s not a huge issue but it’s going to build some terrible habits for me.

Is it possible to get fit for a club after I buy them.