There are 8 levels of tractor tipping. I actually had a little bit of an issue with some of them and got discouraged and took way longer completing these than I should have. The good news is that the game gets easier from here, except for the collectibles, so as long as you're able to hold your patience for this one, you should be fine for the rest of the game.
Tractor Tipping is a mini game in which you need to avoid the tractor who is protecting the tractors. You will need to go up to each of the sleeping tractors, honk your horn, thus flipping them over, before time runs out or you get caught. This can be difficult since the terrain and slopes really make it difficult to totally navigate wherever you want.