transmission ISSUE

I have a Honda civic 1988 model anf got stuck up in snow. I was rtying to take it out and dhifting geras back and forth . I had to call a tow truck later. Now only mu reverse gear is not working, I can shift the gear lever to R, however the care dors not move, all other gears are working normally

What shouls I be aware if before going to a workshop, so that I do not get rippped.

Thanks