Hi, the first guide you've linked is Vladimir's tool which operates on the phone's internal memory. It changes stock partitions' sizes so we can enjoy more space for data. It has nothing to do with sd cards. It's a remedy for a low stock internal memory, since you get 2,6 GB for data instead of 1,4 GB. It works from within a compatible recovery.
Using tools like this is always risky, but the benefits are incomparable. You should try it yourself and read instructions carefully, there's no better way.
The second link is for a trick I never tried and it doesn't come from this forum, so lets skip it.
All your concerns has already been answered in this thread. I know it's a lot of pages to read, but you need to do it. BSOD in win8/win10 has been answered like thousands of times, btw