I've been a supply teacher for 3 years now and have been lucky. I've been pretty much (well almost entirely) fully employed and have had to book a day off if I want one. All of this has been secondary and medium term, like half to 2 terms. Recently though my contract up to Easter was cancelled because the sick teacher came back and since half term I've been doing day-to-day primary. I've done years 1, 3 and 4. The funny thing is.....I rather like it! The little ones see a supply teacher as an exciting new person and genuinely want to please you. They are polite, work hard and are very helpful. They thank you at the end of the day. On the other hand, secondary pupils view a supply teacher who's in for just a day as fair game and an oppurtunity to have a day off and not do any work. I am on primary supply next week too. Love it!