So I'm going to try out an 18SZ. Coming from the 12X and XG11 the switch layout is a bit different. I'm curious how other people layout their TX's.

A- Gear, B- Flaps, D- Smoke on/Off, E - Smoke Trim, F- Gyro Gain, G- Lights,I- Gyro Mode, J Air Brakes, RR Slider - Wheel Brakes Mode 1 Transmitter

A gear, B smoke, D flaps, G gyro, J brakes ( Mode 2)

A=Flaps I moved a 3 pos switch from the front instead of the two pos for flap up, T/O and Landing Flaps
B= is my condition switch and I tie the gear into this switch as well
J=Engine cut since its a spring switch
I= throttle hold on my Helis nothing much for jets
R slider is my brakes
L slider I use with the gyro
Front switches are for things like the canopy, speed brakes, smoke or maybe gyro stuff
E=trim for the nose wheel since its on a different channel than my rudder in jets

Set it up as close as you can to the way you had the 12X and/or XG, and that way there's a smaller learning curve to handle in terms of remember what this "new" switch does or doesn't do.