While I am by no means an expert, I have been teaching myself Spanish for the last few years, and I can honestly say that the most important thing when it comes to success is confidence and motivation. Nothing else will help you. You can make Anki decks of 10,000 words, buy every level of Rosetta Stone, even hire a private tutor, but none of it will do anything for you if you don´t have the motivation and desire to go out there and use the language. I have read every article out there by someone who learned 5 languages in a year and I have no doubt that it is possible, but there are no magic tricks and no easy solutions. If you want to learn another language, you have to dedicate yourself to it. This does not mean transforming your whole life around. It just means you have to put in the effort. Good luck.