OK, I'd let Poconos, aylad or WaterMom direct you on that--they are GREAT at such things--explaining it to the non-mechanical. Since I've only had my MV apart once, and that was years ago, I might lead you wrong (I'm very mechanical, and if I really know something, I can guide a beginner through the steps, but not if it's vague).

At worst, you'll have to replace the MV, but I doubt that's necessary. What you WILL need is a replacement spider gasket for the make and model.
You'll have to disconnect the MV from the pool's plumbing and remove it from the filter, making sure all the pool's drains and returns are plugged.
If it was installed with quick-connect junctions, it's easy. If it's all glued in, it's tougher.

Carl