My first Spanish classes with the lovely el maestro, also known as Ada. A professor in languages (if I have understood correctly), who speaks fluent English (although we mostly speak in Spanish, well, at least she does, I speak in bla bla language), and is really nice and quite well structured.
We spent two hours together this first day, and I think we were both surprised of how much I actually manage to understand. And even how much I can say.
Words only though, sentences are always a pain because of conjugation of verbs and so. I guess I have picked up more Portuguese than I thought, and I use this in combination with my fluent French, especially to understand, but also for guessing how to say a word.
For speaking however, the French-Portuguese mixture in my head has a tendency to screw up my pronunciation and make me mix words partly (I was saying eu instead of yo for the first 3-4 hours of classes). I have also already encountered my first 'fake friend' (faux amis in French), as créer in French means to create, while in Spanish it means to believe.
But in general, I can feel that knowing another latin language fluently and understand the grammar, plus having heard Portuguese spoken for the last 3 years and picked up some expressions and words, really does help.
So, my conclusion after this first day was that 'I rock' ;) and will learn Spanish super quickly. Not to become fluent and speak without mistakes, but to be able to communicate. Two days later, my impression was the opposite as I struggled with every word, but let's blame that on an overheated brain.