I think this is a fair question for anyone tackling a second/foreign language.
There are different levels of memory. Your native language is perhaps at the deepest level of memory. Your second language, English, is moving between short-term and long-term memory. There are several ways to help your memory along until those English words become automatic.
1) Study and drill vocabulary. Every once in a while review previously learned words. Once you can recall words from a few months ago, which you have not seen in a while, perfectly, you're ready. I suggest a spaced repetition flash card app like Anki.
2) Exposure. Immersion is a great way to acquire language. You aren't actively and consciously studying it, rather you're developing your deductive skills to guess the meaning of words and sentences unconsciously. If you're not living in an English-speaking locale, movies, TV, books and so on are a decent substitute.
3) Practice what you know. Practice conversations from your textbooks, etc., to get used to the flow of conversation. Try making a variation that it true to your life (if I'm in your town, how do I get from the super market to the post office?).
4) Find a language buddy. Find some you you can practice English with. The important thing is that this person will just let you talk without them trying to correct your errors. You want to feel comfortable with speaking and listening and getting what you want to say out.
5) Find a stickler. Find someone who is going to work with you to correct your mistakes or say something more naturally. You want this person to make you speak better and up the game.
