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Technically while under nitrous oxide you would likely be impaired and meet the legal definition of intoxicated. You have to meet the legal definition under penal code 49.01(2)(A), which is the definition for intoxicated for impairment.

Sec. 49.01. DEFINITIONS. In this chapter:

.........

(2) "Intoxicated" means:

(A) not having the normal use of mental or physical faculties by reason of the introduction of alcohol, a controlled substance, a drug, a dangerous drug, a combination of two or more of those substances, or any other substance into the body; or

(B) having an alcohol concentration of 0.08 or more.

So, best to leave your gun in the vehicle while having the work done. The effects of nitrous goes away very quickly, and when they release you to drive you should not be to the level of impairment that would meet the legal definition IMO.

NOTE: I am not a lawyer and didn't sleep at a Holiday Inn Express last night.