Going from an XLT to any Minelab, you will initially HATE Minelab. Some of the sounds you have trained your ear to reject, using the XLT, will in fact be GOOD signals on the Minelabs, and vice-versa. And you will probably be used to swinging fast with the XLT (the faster you swing, the deeper you go, with the XLT, right?) But with the minelabs, you can slow to a small crawl/wiggle. And the tones will initially drive you nuts.
The best thing I can suggest is, to go out with a proficient minelab/Explorer user (not just a sand-box hunter, but someone who routinely comes in with the old coins), and have him flag deep coin signals for you to cross check. Also have him and you flag and cross-check signals that he would say to skip, and try to find out why. Ie.: how they differ from the sounds he would chase. Watch the way he swings/criss-crosses over the signals, listen in from his headphones and listen to what he's trying to isolate. To buddy up with a proficient user is about the only way, since the Explorer (and sovereign, etc...) are so tone/sound specific. And there is no way, in printed text, to explain tones and sounds. They have to be heard/shown.