Another piece of amateur advice is about the word verification. The new form of word tests with the ink splash is a big pain in the 'you know what.' They are very difficult to decipher. I can't count how many times I've guessed wrong and had to redo it.
My last piece of advice is to have fun and not stress out if you're having trouble getting around to all the blogs. Some days you'll make lots of stops, but there will be days when life interferes and you can't make the time to hop around for an hour or more. Don't sweat it. I used Sundays to do some catchup last year and suspect I will this year also.
If you want more advice, visit the A to Z Challenge Blog. It is filled with good ideas.
So what part of the challenge is the biggest for you? Visiting? Posting? Something else?