I'm missing Lisbon, where I usually live (over 300 days of sun yet it never really gets unbearably hot). I can't imagine being in Andalucia during the entire summer, though I hear Granada isn't as bad (probably due to being 30 min to the mountains and 30 min to the beach).
https://www.theguardian.com/uk-news/2016/sep/13/uks-hottest-...
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).