Shifting too far in 3rd gear....?

Hello All Experts and novices. Like myself.

We have done everything so fast but it keeps missing 3rd mostly on higher rpms it's done it on lower speeds but it will happen mostly (95%) going into third add if I was racing the car.
I do push the car hard and even faced it going from 2 to 4th not waiting to see if 3rd catches but it's a problem.
Do you believe the whole tranny must come down now to repair maybe 3rd gear or can it be done with it on the car ?

Thanks.

PS I only ask those because I'm going to a transmission specialist and don't want to look real dumb, and get fleeced as well...