I used to run after work and head out around 5.30pm but in the last couple of weeks I've been getting up to go out before work.
I start work at 7am so I tend to get up at 4am and get out by 4.10 - 4.15am so I'm back to have a shower, breakfast and get to work.
It hasn't been as hard as I expected, I do have a bit of a mental battle for 5 mins when the alarm goes off but I like the feeling of going into work knowing I've already been out and have the whole evening free. I think after the first few times your body adjusts and it gets easier. I'd say persevere with it for a few weeks.
As Tom13 says, get your kit out ready to go, I even get all my breakfast stuff out and ready to go so you don't even have to give it a second thought.
I've only done the Reading half but would echo the comments above, it's well organised and well supported, especially through the town centre. The dual carriageway near the end is quite boring and I've always found it quite tough as it's near the end when you tend to be hanging on.
They've revised the course slightly so the diversion away from the stadium is at the beginning and not the end which was always a bit soul destroying.
The WW50 sounds like it's going to be a muddy slog fest, part of me wishes I was doing it but being shin deep in mud isn't my idea of fun if I'm honest.
I'm back in for the SDW50 again next April and have put my name on the waiting list for the SDW100 but I've got my eye on the canal slam as well, if I decide to take the plunge with that then the SDW100 can wait for another year.