Just a couple of point I'd make.

1) The "billing company" information should be the first thing you should look for in addition to looking up the prospective site you wish to gain access to. If it isn't a well known and respected company like CCBill, Epoch, etc. then you should simply AVOID trying to get membership at the sites that use this unknown billing company (or one used by very few sites). You want to be damned sure that when you type in your credit card information that your browser window is on the billing site you expect it to be on.

2) He says to avoid downloading archives from porn sites. If your intention is to download entire galleries of images from a pay site, his advice is silly. (It is completely understandable for unknown/freebie sites that you are not intimately familiar with). Think about it. Some adult sites such as MET-Models have models with dozens of galleries in addition to media files, and each gallery can contain anwhere from 20-220 images. If you want to collect 100 dozen galleries or more during the month you have paid access to the site, manually saving images in your browser is going to chew up a lot of your paid-for time. The mere idea of doing that, and paying for the priviledge, is heresy. So, what you really need to do is get a virus/malware/trojan detection application, and simply scan all your incoming archives.If you aren't trulyInternet savvy anyway, this step should already be in place on your system to begin with.

3) ASK QUESTIONS! Any pay site, including billing companies, should have responsive and helpful customer relations facilities. Some sites may take 24 hours to respond to queries, or maybe even more if it is some sort of local holiday. Some sites are much quicker. But the point that should not be lost is ANY good site will answer any and all of your questions (Unless you are purposely trying to be a dick). Check out their frequently asked questions (FAQs), use and copy texts & URLs of any agreements to a text file, and if you have any concerns or queries, ASK! If you are unsatisfied with explanations or feel uncomfortable about anything, all you need to do is AVOID the site and find some other place which you are comfortable with. Reputable pay sites EXPECT you to be diligent with your money, and naturally curious about procedures, etc.

4) Never sign up "in a hurry". If you get an impulse to sign up to any site, do yourself a favour. Take 10 deep breaths, and instead, spend your time investigating the site, it's billing company, it's reputation, it's content, etc.  This is usually the biggest mistake newbies to the pay-site scene make. They end up somewhere they did not intend to go, or in the clutches of some scam site which has/had no intention of delivering quality content, or any content.