The easy way to do this is to play multiplayer, your friend get the coins, then teleport to you and then you get the coins, etc, that way none of you fall

https://youtu.be/49ytFTRVTM8

Coins 1, go down this hole and you will get it
Coin 2 to the left of these two thing in between the saw section
Coin 3 at the end of the two bullet bill section
Coin 4 to the right side of the lady
Coins 5 to the left before the cheese platform
Coins 6 jump to the left of that screen to reach an invisible platform