Monty,
We’ve all been there, so don’t apologize! You have to start somewhere. I would like to offer you our written guidelines for your case.
We have support tip on possible reasons for coordinate mismatch. You can check it out and see if the steps from it will help you. We have a support tip on transformation grids. We also have information on the coordinate system we have for the UK.
If there’s still an issue, please tell me more about your workflow, including what coordinate system you use and how you set up your base.