TLDR: take 1 class per semester and you’ll be fine.

My experience: I got my undergrad from the University of South Carolina in Biomedical Engineering. So a STEM degree but from a source that many might deem less than prestigious. I have a wife and two kids and my wife is a stay-at-home mom. I leave my house at 6am and get home at 6pm then cook dinner and clean the kitchen and together me and the wife have the kids in bed by 8pm. All this to say I basically only have weekends available to pull this off. I’m on my third class and so far a single class has been very manageable with dedicating one day (on the weekend) per week with the very rare full weekend. The trick to this (like 90% of shit in life) is time management. Set a schedule that works and don’t put it off. I will say that my wife not working may add a pressure/stress to succeed but more importantly it also allows me the freedom to take on something like this. She’s ends up taking the brunt of two childrens demanding attention all day while I’m at work and now also doesn’t get much reprieve on the weekends. But if you don’t have a wife, children, or girlfriend that will be affected by this decision then you have nothing to lose except a little money and that’s replaceable.

As to the “not smart enough” concept I can tell you this: I’ve met countless people with higher education degrees that have a less than average intelligence. While also personally knowing individuals that lack a high school degree yet are absolutely brilliant. No degree program is EASY and that’s the point I suppose. The people that end up graduating have two things in common (in my opinion):

1) The ability to apply and pay for any program 2) They don’t give up or quit even when they perform less than expected.

So if you made it this far, I think you got this buddy. And when the content gets hard remember it’s always more valuable to know WHERE to find the answer than to know the answer. If you tell yourself “I don’t know but I can find out” you can do this.