Thanks for the advice Emily I'm definitely thinking of at least looking into going indie. I have a normal job though so is it possible because I wouldn't be able to answer calls all the time?
I only do incalls one day per week and have my phone switched off the entire rest of the time (although I could technically take calls, but when I'm focusing on an important piece of work I don't want to be distracted by some timewaster ringing to ask me pointless questions so he can wank over the futility of it all), so I'd say an emphatic YES to being able to work independently around a regular job.
I do display my phone number on my AW profile - paid for by credits earned from my private gallery, in which there's no fanny closeups or anything, just my 'candid snaps' in nice lingerie so clients can see my glossy pro photos aren't airbrushed madly - but encourage clients on my AW profile and also on my own website to email me to book ahead. When I switch my phone on, there may be voicemails and texts, but I don't usually need to respond to them as the clients who can read my instructions properly give me more than enough business to fit into my limited hours, and I can't help liking the ones who follow instructions properly just that little bit better.
I also utilise an availability calendar on my site so clients know when I'm available. You can look at it cos my link's just under my little profile pic on here; it's that little globe icon.
Yes, you do end up sending the same response to zillions of emails, but just write out a template for yourself and copy+paste. "Thank you for your email, [Jeff/Bob/Pete]! You can see my upcoming availability here: [your website link] If there's a day of my availability that would suit you, just email me to let me know the time you'd like. Thanks! [Your work name]" ... or whatever. Not everyone will respond, and some guys will want to schedule a phone call with you to check you're genuine (just be sure to avoid sexual topics on the phone cos that's just free phone sex for a wanky timewaster - always let them know to email you any questions and get off the phone ASAP - genuine clients will follow your instructions while TWs will wander off to an easier target).
It will take time and experience for you to figure out which available times, out of your limited options, are the most lucrative, but stick with it. Also, be sure to employ a proper confirmation method which will avoid you taking bookings from people you'll never actually hear from again (although a surprising number will fake-book multiple times, so also maintain a nice Blocked list within your email so you're not bothered by their silliness).
It's all surprisingly easy, but I suppose I'm speaking from 3 years of experience here. At the beginning, you just need to be patient, and make full use of your security buddy for emotional support and an extra brain for those, "is this guy a nutter or is it just me?" moments. Do the same for her, of course. Independent work without friends is probably the loneliest (and most dangerous) thing, so be sure to have a buddy or two in place as a support network.