Sounds like you have been on boats before by the question of the I/O noise level. So I'll save you some BS.
Once out on the water, the boat will handle similar to any other boat, WHILE UNDER THROTTLE. They best advice I can tell you is to think of this boat as a 19 foot waverunner. It handles the same. Once you let off the throttle, there is no steering. Meaning you will hit the dock or another boat or worse, a swimmer, without throttle. If you are familiar with waverunners and how to handle them in docking scenarios, you'll be fine. Forward, reverse, forward, revers, steer, forward, reverse, etc... You'll eventually be able to walk the boat sideways. You'll also notice that steering is similar to a waverunner as the wheel doesnt turn but 50% either way. Once under way, minor steering adjustments are needed. It handles VERY well. SO well that under WOT, you might scare yourself on the way the boat will corner. Again, its a 19ft jet ski. You'll love it. Take your time. Get to know your boat, yourself and learn how the boat is different to I/O's. Its not rocket science.