For $250 + the cheap access afterwards it is worth it. You would probably spend that amount on "mistakes" in a short time!
Film processing is actually easy, once you have standardized on a film/developer. Wet printing is a different story altogether. The subtle differences in papers, developers, judging negative densities and the impact on the prints can use up a lot of expensive paper.
You also have the advantage of instant feed-back and rather than having to guess what went wrong - you can ask someone who knows.
Even basic skills like burning and dodging use up a lot of paper to get right.
In bl/w photography there is a point when you pull the finished print out of the last wash cycle and you realize that it is "magic". You can study the chemistry, you can analyze the process - and it is still a magical moment.
Dont just do the course - also find out if there are any galleries that shows photography nearby. Go and look at the prints - nothing teaches appreciation than seeing good, really good prints! You then have a "target" for your own printing.
There are many, many more good photographers than good printers. Most of us can pull out a decent print - few can do a master print.