A quicker and more accessible method might be to read Dealing with Difficult People by Brinkman and Kirschner. You can knock it out in an evening and it may give you a bit of insight into how to deal with the subject matter. No affiliation.

Broadly, I divide my dealings with difficult people into these groups:

• Turkeys: This is my term for people that offer me nothing and are just aggravating. I do my level best to spend as little time interacting with these people as possible.
• Turkeys at work: This is my term for aggravating people that I need to interact with professionally. For these people I apply the lessons I've learned from the book above and other formal and practical study to figure out what they want or need. I then try, within reason, to provide it to them. If I can't "turn them sweet" and they're too aggravating over time, I have been known to limit or end my association with them. I've fired clients and in one case quit a job because the interpersonal unpleasantness wasn't worth it to me.
• Friends and loved ones who do aggravating things: self explanatory. I am far from perfect and I try to keep that in mind as I deal with these folks. Sometimes the roles we were born into (brother, sister, child, parent) follows us around and makes it hard for some to act like adults. Mostly, though, I find that calming myself down and then helping the friend or loved one calm down allows us all to communicate clearly and come to resolution when issues occur.

The key for me is self-knowledge: I need to recognize when I'm being emotional or unreasonable and deal with it. That allows me to calmly and rationally engage with others and contribute towards the resolution of problems. I'm way better at this since I had children .

Back to the MBTI. If you already understand yourself and where you fit on it, it's probably not worth the effort. If on the other hand you're not sure how you fit within its framework or how the others around you might fit, you'll probably find it very helpful.