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Education is always the best investment. I would totally recommend doing it if you can. A lot of undergraduate school offer online classes, which is great for people like you. Keep your job and start school online. One thing you have in advantages is, work experience, try to apply what you have learned at work to school is the key to help you succeed.
Check out reputable schools that offer online degree programs. Most of them enable a high degree of flexibility and are just as credible as their on campus counterparts.
Being over 40 and going through that same process, I can tell you it is worth it.
What is your hours far as work?
Time management (there are great books on this subject, or talk to someone who has done it)
Consider internships, they can provide flexible hours -- many large corporations offer reasonable compensation.
Don't take too many classes upfront, it can get overwhelming. Ease into going to school until you get the hang of juggling school with work.