What is the best way to learn Spanish and Brazilian Portuguese quickly?

I would like to learn Spanish and Brazilian Portuguese properly, but also fairly quickly.
What is the best way to do that?

How Close is Brazilian Portuguese to the Spanish Language?

I’m studying Spanish, but recently I’ve come Brazilian Portuguese and i just LOVE how it is pronounced, how it sounds, everything!
If i learn Spanish fluently, would i be able to learn easier Brazilian Portuguese? Are the languages remotely similar?