whatever you do, don't practice on someone else's property unless they know up front what you are doing.
There is quite a learning curve for the mulching business. You will be asking your machine to the most demanding job there is for a compact machine. A t300 will operate a mulching head "okay" if you have a K series with 37 gpm. Cooling will be an issue and that is part of the learning curve to keep the radiators clean.
Must haves:
-air compressor to blow out engine compartment, radiators, and cab
-a lot of patience with dust entering the cab (plugging holes takes hours and testing and more hours)
-fire extinguisher
-good insurance
-fuel transfer tank (figure using a day's worth of fuel in 4-5 hours)
-absolutely clean hydro oil and filters to get started
-ditto on radiator
-lexan door is a must have or you are playing with your eyesight and life
-plenty of tools for changing teeth (impact wrench) etc. extra teeth depending on the type of head
-you need to demo the heads for your type of terrain and cutting conditions. Some heads like Robbies take less hp and will probably be more efficient in many conditions but I like carbide for rocky conditions
-a good relationship with a dealer so you can demo before you settle on a head unless you can find a good deal on a used one (and make it work).
-a place to practice..that's one of the biggies I see to getting started so you can see machine limitations, get used to keeping it running cool, and learn how far debris can be ejected so you can gauge how close you can work to people, houses, cars, roads, etc. Hope this helps.