News from the radiation room

I am finally going to do it - from 5/4 to 6/13, I am getting radiation treatments. This means I will be spending a lot of time sleeping and drinking tons of water.
I go to the back room of the clinic for treatments. First, they make me change into a gown; why???, since I just have to walk across the hall and take it off. I get lugged onto a treatment table with a hole for my head, stirrups for my arms and a leg rest.
Today, I got my x-rays done and was tattooed. Apparently, they just wipe ink on your skin and take a needle and push some of it in. And, apparently, I am a wimp for saying it hurt (which it did).
My ladies take no guff from me. They push and shove and then, order me to lay still as they run out of the room. I am warned that they can see me and hear me. I am then forced to lie still and listen to oldies for 15 minutes.
When it's over, I am rushed into the changing room and headed out the door, with orders to come back tomorrow.
Is this what it's to be a car getting an oil change? A dog at the vet's?
I toss back my natural rebellion, because I am warned that if I move, I have to start over again. June, come soon. Please!