>>1
Step 1: forget everything you know about grammar. Korean grammar is fucked beyond belief if you think of it from a Romance/Germanic language POV.
Step 2: Always learn the 'polite' form ("blah-blah-yo"); ignore any native-Korean-speaking friends who try to get you to use the informal/intimate. It's easy to them because they grew up speaking it. You'll fuck up, use the wrong form, and irritate someone, and it triples the amount you have to memorize.
Step 3: Realize that 90% of the trouble comes from verbs. Every single verb is about six smaller verbs strung together. Think about breaking them apart and figuring out patterns, but focus on rote memorization of useful phrases,
Step 4: Be prepared to spend two to three years of regular study to become able to communicate at all it, and six or seven to become fluent. You'll never sound like a native speaker.
Seriously, it's a shitload of work for a language that isn't widely-spoken.