KayBayRay, I've done it before, but I've also struggled with Microsoft Flight Sim flight dynamics for a few years.
As long as you can land a plane on a regular airfield, you
should be able to land the B-25 on the CV (at least I could on the old ones).
When you're landing, make sure that the CV isn't turning at all. Next, make sure that you have full flaps, and gear down well in advance. Don't be afraid to use full throttle with WEP
as necessary if you feel you're getting to low.
Finally: make sure you come in
well to the left of the carrier's island, but also ensure you avoid the elevator.
Good luck

<S>
Yossarian