The easiest and safest movement is to double jump kick near the top of the tree. Kicking while in the air prevents Mario from grabbing the tree.
For the double jump dive into the first red coin, it's highly recommeded you copy the camera inputs. At the start of the stage, c-right followed by Mario Cam + c-down. Make sure the Mario cam + c-down is input before Mario touches the ground to avoid grabbing the tree. Walk a few frames before the kick so that Mario is closer to his peak double jump height when you dive at the coin.
Intermediate
Once you are in the slide, the strats are the same as Advanced.
If doing this with 100 coins, The first red in the route is a little tough to grab. As a beginner, the easiest movement is to double jump kick near the top of the tree. Kicking while in the air prevents Mario from grabbing the pole until he lands on the ground again. This makes it easy to strafe in the air and ensure you grab the coin. For the advanced movement (buffer kick -> double jump -> dive) to grab the coin, you want to delay the buffer kick slightly so that Mario is closer to his peak double jump height when you dive at the coin. This helps prevent grabbing the tree out of the dive.
