[HMaFiA]

1. Trapping the ball is done automatically by the players, holding the Right Trigger makes the ball harder to trap and usually bounces off the players foot for half a yard or so when holding the Right trigger, so never hold it unless u have alot of space and are ready for a run, but i still wouldnt recommend EVER holding the Right Trigger unless u have open space to run into.
Holding the Left Trigger makes u control the ball much closer so defenders cant easily steal it from u after a Trap, would recommend doing it except when chesting the ball, sometimes the ball just bounces yards away when using ur chest and holding Left Trigger, not sure if this is just random.

2. Jostling while running is done automatically too, all depends on the players strength stats i believe, so while running and theres a defender beside you, u will jostle and i havent found any way of stopping them unless u have a stronger player. Or using the right trigger to run away from the defender if ur player is fast enough.

3. The shield ball technique works great but it requires some practise and you do need some time for ur player to get into the shielding position, now u cant just hold it and keep the ball for ever but you can hold the ball for a second or two longer while using it and right when the defender is about to tackle you u turn ur player to the opposite direction of the defender and ur clear for a run. Try it on Amatuer difficulty and u'll know wat i mean.

Hope this helps.