Things which make Spanish relatively easy at a basic level:
* Pronunciation - pronunciation is entirely predictable from spelling and the rules aren’t difficult.
* Vocabulary - A lot of English vocabulary is from Latin and it’s actually very easy to guess what a lot of Spanish words mean.It´s not hard to guess.
It´s easier to make initial progress in Spanish compared to most other languages, particularly French with its pronunciation difficulties and German or Russian with their complex grammars. However, to get past a basic level and progress to an intermediate or advanced level is going to take a LOT of work, same as any other language.
I'm also interested learning Spanish and I started watching free online learning available in the web or maybe invest in books. In just a few days I actually learned few basic words! Awesome, right? When you find it interesting and you need to advance to the next level then try to check out formal courses online. My advise, start from baby steps and you don't have to pressure yourself too much. Good luck!
Learning a new language can be challenging. I would recommend taking it in school if at all possible. Why? Learning with other people will actually help you learn the language better. It is one thing to read it and write it. That is you talking to you. Speaking to others will require you to put the words into different combinations that you may not have learned in school. Plus your classmates know where you are in the study. Some of it is the same memorization that you did with English, like learning the alphabet and counting to 100. Other elements are harder, like learning a complete sentence. Spanish is particularly challenging to English speakers because some words in Spanish are considered male and some are considered female. The word "the" in English has no gender. However, the word "the" in Spanish becomes "el" or "la" depending on the word. You will find that in most Spanish studies you will learn the combination. Like "el nino" (the boy) or "la nina" (the girl) which helps a lot. I would say that Spanish is like learning to dance, play a sport, or play music. It is a combination of learning the rules and practice.
I really believe that you will get a lot from learning Spanish. If you cannot take it in school, I would recommend a program like Rosetta Stone or some other tool that will allow you to learn Spanish a little bit at a time. Remember, no matter how much studying you do on your own, you need to practice your skills with someone who knows Spanish. That is when it will become easier and more fun.