QuiltE

No, you are not being ridiculous!
Of course, there is always a concern ...... the good news is that you are in control of your machine.
Just the same as at home, you can always do things to your machine.

Just give it your full TLC and I am sure you will be fine.

If it is hot or cold ... best to just put your machine into your car as you leave, and not have it in there for an extended period.

Keep it upright and when putting in your car, have it sitting, so it will not slide around, as you drive, or if you should stop suddenly. I like to keep mine wedged between the front/back seat of the car. That's what works for my machine and vehicle ... not necessarily yours.

I worry more in getting it in and out of my place, as I take it up/down the stairs.
Likewise, at the LQS' that have their classrooms on the 2nd level.

The other fear that I do have is in the classroom.
.... some are well planned and there are no issues.
Some cram too many people, tables and machines into a small space, and it is too easy for someone else to knock my machine. Some shops create a maze of extension cords, and a huge safety hazard is created. A machine could easily go overboard as a result. Not too long ago, I know a lady who did a nose-dive at a class, tripping on one of those cords. Machines were OK, but she was not. The store knew about it, offering to get ice for her wrist. They helped her pack up and take her things to the car. After getting home, she decided to go to emerg. I was disappointed that the LQS did not phone the next day to check as to how she was.

I'm not trying to scare you, but these are a few of the scenarios that I have been involved with. It has changed my opinion of a couple of shops. As a result, I will probably not go back to one of the maze-shops for a class again.

It's not risk free .... but you really should not worry much, so long as you are careful and use common sense.

Good Luck ... and enjoy your course!!!