Assuming you want to do an online boot camp? Some people work better with in-person learning, just depends on what works best for you.

If you can learn while pacing yourself, there's many excellent self paced classes that are practically free, with highly qualified instructors. I've done 5 courses online from Tim Buchalka, because I like his teaching style. And only paid about $100 for a college semesters worth of instruction.

I wasn't trying to change careers, just expand my knowledge in my current job while learning part time, and that worked out well for me.

Given the relationship of html/css to java, I think you mean javascript.

I've been coding for more years then I'm willing to publicly admit. What I would recommend is watching a few starting videos on youtube and after you have some of the basics down, start a small project. Programming books are ok, mostly for reference. If you run into problems, look at stack overflow for solutions and learn to read the documentation. Once you have a little experience, join an open source project and help them solve bugs in their code. You'll get guidance from the other members and they'll teach you about working on a project. After you have some actual programming contributions, you can go out into the market place and companies will be willing to take a risk on you.

If that doesn't sound appealing, then coding might not be your thing because that is 60% of what we do. Read documentation and look up how to solve problems you're unfamiliar with while working on a project.

I've never done a bootcamp. It sounds like they work for some people but I would rather just do it myself

I've never done a boot camp but I've considered creating one because they're easy money.

The way to teach yourself is to build things. If you want a project idea build an engine that behaves like a web crawler and only indexes pages that are banned from Google, then a page that lets you do a basic search of your wrongthink index.