lag and acc # 4

[brownman]

Evening all,Im getting frustrated ,Im trying very hard to get the feeling of lag in my swing,also having problems with getting consistancy with driver and long irons,not to mention understanding TGM book,lol,I practice every day with short shots etc,I use basic drills by hitting through two trees that are close together to a pin,luv it.works very well,but when I get to d/swing with longer clubs it all goes pearshaped,I do have a couple of questions if I may,

1...how essential is the acc #4 for hitters
2...would this assist my search for lag
3...do you have any drills for downswing
thank you in advance