I just bought a home in the CA bay area. My front yard is dominated by a large redwood tree that seems in good health. I really love the way it looks. By large I mean 5-6 stories in height, planted most likely in the late 40s. The tree is somewhat close to my front porch in that eventually some of the branches will probably grow out to touch the roof. I assume I'll need to have those trimmed back.
I don't know how much tree trimmers know about redwoods specifically, so I want to be knowledgeable myself. A trimmer recently recommended thinning out the branches and getting rid of the lower hanging branches. I kind of like the lower branches (still above my head) as it feels more forest'y. I worry about thinning reducing the shade.
What kinds of trimming should I be doing regularly other than keeping branches away from my roof? Are there any other things I need to worry about with an old redwood: watering, pests or anything else?