It's a lot, I know. My best advice...
1) Read the entire AG, slowly enough to understand the path you'll be taking, but not so slowly that you're trying to understand all the details. Read it all. You'll find there's nothing impossible, that it all makes sense.
2) Then start over. Each DAY is a major step that breaks down into mid-sized steps, each of which have do-able smaller step-by-steps.
I've told the following story a few times now, but it's worth repeating...
My first summer job in high school was working in Quality Control for a pharmaceutical company. There were 30 or so different assays to learn (to determine if the right amount of drug was in each type of tablet that they produced).
They were involved and complicated - some took hours, had tons of steps... and I didn't even know how to use a pipette, let alone know even the simplest lab technique.
I didn't think I'd ever get those assays right.
Luckily, my boss was a wonderful person - Bonnie. She'd encourage patiently, correct constructively and praise cheerfully when I'd get the smallest thing right. And, more interestingly, she'd explain WHY each step was important.
That last part ("the why") wasn't actually important to do an assay, although it is in SBI!. Knowing the why enables you to get better once the actual step-by-step gets so routine that you can better focus on buiding the best site and business possible.
Anyway, you can see where this is heading (or I would not be telling the story
By the end of the summer, even the most complex assay was routine. I looked back at the beginning of summer and I honestly couldn't remember why I had found it so hard.
And THAT is something that many SBIers have themselves said, right here in these forums. It SEEMS much harder than it actually is. Don't be afraid of it, nor of making mistakes.
Once you reach DAY 5, if it's still not clear, repeat from DAY 2. It'll make more sense a third time through (your first time being the read-through).
It's not EASY to build a business, online or off. Anyone who says it is, well, s/he's lying.
But it IS definitely DO-able. Hang in there - it's worth the effort.
And oh yes - there are lots of "Bonnie's" here to help as you need it.
Persevere and good luck!
All the best,