A trip to the dentist

I went to the dentist yesterday. I'm laying in the chair, I have my blue bib on, I'm ready...and the hygienist hands me the suction tool. She says, if I feel the need to suction, I should go ahead, just flip this little switch (she shows me the switch) and the vacuum will turn on. Here's what went through my head "Go ahead? I'm not qualified for this! Don't people go to school for years to learn how to suction?" Am I right? I thought so.