My best method is to stand up facing rearwards and operate the shifters like joysticks. No having to think about it. Steer it like a bulldozer.
Course with the levers on the left side of the dash make this easy to do.

I changed mine from in to out. World of difference in backing up control, and all around docking.

Bigger the prop. pitch, faster the reaction time per gear shift. My 24 skater with 34"p cleavers reaction time is 1 to 2 seconds at the most. This boat can spin around in a couple of seconds. No throttle needed. By the way, I took it out Moriches Inlet this weekend in 3 to 4 foot swells and had the best ride of my life. Every landing was perfect. Can't wait for the next off-shore trip. Also have an 18 skater for sale. Anyone interested please give Bill a call at 516 398-7132 for any information. Thanks Bill A.

Drive it like bulldozer.

Yup, that sums it up. If you can't understand that, you have bigger problems ;-)

I switched mine in, got 1mph, looked like a 12 year old around the docks. not worth the 1mph.

Bump for good information for someone that is moving from a single I/O to twins.

same

Go out some place in open water, and practice to see how the boat reacts etc, the only tip I can say is experience, experience, experience....

Do not come in hot...if you manage to screw up, back out and do it again, don't panic...slow and steady wins when it comes to docking...there's no first place for smashed fiberglass or how loud that lovely noise you hear when you smash the dock coming in overly aggressively...

I know that my boat with 17" cleavers turning "IN", can be fun around the docks. It defintly takes some getting used to. Mainly, backing up is the problem. Sometimes, I find myself having to use the steering wheel when trying to reverse in a straight line. Sometimes I have no choice but to back up, put one in forward to straighten it out, then back up some more.