Bigspin

In order to even think about attempting the bigspin you will first definitely need to have a good grasp on the pop shove-it and 180.
*Bigspin's are easier to do with a good amount of speed.
1) Place the ball of your foot on the tail as if you are going to do a pop shove-it, and position your front foot below the bolts. Your front foot should be positioned at the angle for a kickflip.
2) Your going to do a backside 180 and a 360 shove-it simultaneously. So, begin your backside 180 ollie by smacking down the tail, but instead of letting the usual 180 take place, shove the board vigorously with your back foot. Send the board spinning. The best way to unsure no flip to occur while doing the big spin is to smack the tail dead center.
3) You will now be backside 180ing as the board is 360 shove-iting. Here is where your front foot plays a vital role. The foot should hover right above the spinning board insuring that the boarding doesn't flip and that you stop the board spinning once it has made a full rotation.
4) After the board has gone 360 and you have gone 180, it's time to land. Your feet should be over the bolts guiding the board, or as close as possible to avoid any board breakage. Extend legs back down and land.
5) Roll away like a champ.
Practice, Practice, Practice