Sometime, watching a twin-engine aircraft taxi out and take off, you've probably wondered if you could fly one. When you poke your head inside the cockpit, it does look kinda complicated. Lots of knobs and dials there.
But to let you in on a little secret: it's really not that tough — most of the time. When everything is working, you just grab two throttles instead of one, and away you go.
The systems can be a little more complex — the fuel plumbing is a bit bizarre in some types, there's likely a gas-powered cabin heater in the nose [a la VW bug], the props are constant speed, and the gear retracts.
But when everything is working, it's not really a lot different than flying a retractable single such as a Bonanza, Mooney, Comanche, or Arrow. In fact, if you're considering getting your multi endorsement, one idea is to first get checked out in one of these retractable-gear singles.
The transition from a simple, fixed-gear, fixed-pitch-prop single to a twin is probably busier than it needs to be. Make life easier on yourself.
If you can, learn about constant speed props, cowl flaps, retractable landing gear and other fancy frills in a cheaper single-engine aircraft before you start shelling out the big bucks renting a multi.