First off, if your Brother printer only has a 250-sheet capacity paper tray, you need this (it also comes in handy if you use both letter- and legal-size paper frequently and don't want to hassle with the front feeder). Second, it couldn't be simpler to install. You'll need at least two people (three if your printer is on the heavy side) - one (or two) of you to lift the printer up, and one to slide the new tray underneath and guide into place. Snap. You're done. Then on your computer, open up the printer options for the Brother printer and tell it there's a second tray now. Love it.