Forrest has limited power and Anderson has a great chin. Forrest is more straight foward with his attacks while Anderson is more of a surgeon.
Forrest will need to use his strength advantage (Forrest is one of the stronger 205'ers) to get Anderson down and defend submissions all day. If I were him, I would train with Couture every single day until his fight and work on submission defense constantly.
I know Forrest likes to put on exciting fights and likes to trade with anyone, but his style and his lack of power has him begging to be a highlight reel KO.