Did your instructor suggest this? I wouldn't do it, at your level. all it takes is abit of speed a bump in the grass, a tad bit of head wind or a twitch in the throttle thumb and you could be airborne.
after my students get their turns down pat I'll take 'em to the end of the runway and pratice taxiing away from themselves and then toward themselves, at the time we had grass runway. takes more power to begin to move than to keep moving.
anyway all of a sudden my students airplane is under too much power, I ask her to back off the throttle she says she cant and hands me the transmitter. no throttle response all I could do was wait for the airspeed to build and fly.
throttle servo stripped.
It's your plane but I'd wait