you will need to apply the same steps toward learning and mastering the MXT. If you didn't fully learn and master the last detector/detectors you had, then do things differently with the MXT. Stick with it!
There are some basic 'tips' regardless of the make or model, but here are some "general" suggestions as well as MXT-specific tips:
LOCATION is of absolute importance. You can't find stuff in a site where it isn't.
PRACTICE learning each control, each search coil, and proper set-up as well as search coil sweep technique, pinpointing, and interpretation of the audio and visual display responses.
PATIENCE is required to put in ample time learning and mastering each control function, as well as coil presentation (to include sweep speed, coil/ground position, overlapping, etc.).
VARIETY of sites will help learn how the detector handles/performs with different sets of conditions, such as to-lot sand or wood chip Vs park lawns Vs plowed dirt. Other variables such as pull tab and bottle cap littered picnic sites Vs iron nail infested sites Vs demolition sites with large and small junk of every metal type imaginable, etc.
FREQUENCY of search, not operating frequency. try to get out as often as possible. If you only go detecting for an hour once a week you'll struggle to really learn your detector well. Get out as often as possible. Daily would be great, but certainly 2-5 times a week would greatly increase your mastery potential.
SEARCH COIL SELECTION is very important because one single coil is NOT the best approach for all sites. If anything, a good concentric coil of about 6