Yeah, I wash in the shower as well...... too many tangles if i have to turn my head upside down in the sink.
In terms of protein treatments.... yeah, it is kind of annoying, all the hopping back and forth. But I do it, because like i said, too many tangles otherwise. I kind of just minimize the work by remaining naked and dripping wet the entire time.
Wash hair.... turn off shower, put in Aphogee in tub.... step out onto shower rug (that is covered by towell), stand up and apply blow dryer w/funnel to length of hair (because i dont have a hooded drier)..... after hair has hardened, hop back in shower and rinse out, condition with Aphogee moisturizing conditioner for a few minutes, then put in my own conditioner concoction. Step out of shower (put on robe this time), put on plastic cap, chill for about 20 minutes doing housework, get back in shower, rinse out hair, moisturize and bun. It's a hassle, and a lot of hopping in and out of shower, but still better than washing in the sink!
*I really need to invest in a good hooded drier.*