Yes, Tamarack Flat is the best place, and I've started there about twenty times. The road was closed one year, so I had to start over at Big Oak Flat Road (the highway), and it was longer with more uphill, so I don't recommend that one. The rockslide is actually below El Capitan, on the way from the valley up to the Old Big Oak Flat Road (now an old fire road).
The place to camp first is about 200 yards after crossing Ribbon Creek, while you are still within walking range of the water there. Unfortunately, the best time to go is about July 1 for the wildflowers.
Hey, if you two can survive that trip, then marriage will be easy.