I did two years on Latin on my own. It's a hard language to learn, but with the right program anything can be fun to learn. I used Arteas Latinea, I'm not sure if they are selling it anymore, but it is awesome!! It is so much fun to learn Latin, and wasn't actually that hard.
most-likely hard since it's a dead language, but (maybe since our words now root from it) you can figure it out. really, it depends on how dedicated you are to learning it and how many people you can use it with. i suggest tricking a friend into learning it with you.
You already know so much. The Roman invasion of England and the following French-Norman invasion brought in so many Latin (Roman) words. This Language will help you all your life with the major European languages. Spanish is full of it.
Simple - in fact you already know more Latin than you think you do. Most of the English language is rooted Latin (as are many of the so-called "Romantic" languages) so you're already well on your way. I still remember most of the Latin I learned 30 years ago in high school (salve, magistra!) so it sticks with you pretty easily.
I take Latin at my school and it's pretty boring. My teacher says it takes 10 years to learn it fluently (At least I don't have to take it for a whole 10 years!) Anyways, I wouldn't waste my time with it if I were you, it's really hard.