Brook - do it, learn it in your spare time for six months or something but do it for sure! Study it during down time at work if you can like I did, whatever. Designing a website will get you some money, building up a portfolio of long-term maintenance contracts will make you rich. I'm (slowly) teaching myself this and work keeps falling into my lap. I just got paid $1,500 to spend two days learning the PHP to connect to a simple DB and I have 3 jobs coming up for stuff I kind of know how to do, but will outsource to elance (or anyone on this site if we have qualified web devs here) if I don't have time to learn the code for whatever I eventually need to make. In your spare time take on cheap jobs, whatever and learn to script this stuff.
My one piece of advice is to learn in a text editor like note-pad or whatever for your first few java-script, HTML, CSS, PHP adventures. Then when you do graduate to designing inside a development platform you'll 10x better. My wife learned through dreamweaver and I have to do all her PHP for her now. If you know the fundamentals of those four languages (I'm still working on JS) then you can a) handle most jobs on your own, at least for small clients and b) can spec and outsource contracts to other developers which can be even more lucrative. What's better, making $90 per hour to code or making $10,000 to spec a solution and spend time testing it.
I'd stay away from DW, it uses tables for layouts... proper CSS is much better. Maybe if someone has made a website in DW prior it would be useful for editing that but you won't learn much.
No jokes, I'm probably going to take in about $15,000 in website work this year, spend 1-2 hours on it a day and the occasional weekend and since I can claim a lot of my daily living costs as business expenses it's largely tax free and comes on top of my regular income. There is no downside to you getting stuck into this.