It really does depend on your situation though. I have one to one lessons twice a week but it's not really enough as I manage to get by without having to speak that much during the week.

However, I know people who have picked it up fairly quickly because they are working in a public facing environment where they really have to learn fast.

I wrote down a grammar card with all the verb conjugations (-AR, -IR, -ER verbs) and carried it in my pocket everywhere. When I couldn't remember, I (as soon as practical) pulled it out of my pocket and double-checked.

The most difficult one for me was getting la/el correct. Although by that point I knew the correct gender of each noun, it didn't come out correctly when speaking quickly.

It helps, a bit, and is lot more convenient than firing up google translate every two minutes (which isn't that much use for a lot of grammar anyway).