This is just a quick, simple tip that I found out a few years ago and think every primary school teacher should know.
When sticking name labels on trays, desks, bag hooks etc use contact as an under layer and then stick the name label on top. This makes it much easier to change labels for the new year as the label peels off the contact more easily than other surfaces. Alternatively you can peel the whole label off and start with fresh contact as well.
When making wall charts for birthdays, homework, readers, class jobs, etc cover the chart in clear contact and write on the chart with a dry-erase or whiteboard marker. Then you will be able to reuse the same chart year after year.