I wanna learn Spanish

I'm planning for a trip to Spain and Portugal the next year, so I'm going to start learning Spanish soon.
My guitar teacher is a language Freaker. He says Spanish pronunciation is easy to learn for Japanese people and that the Spanish language is similar to the Portuguese. They can understand Spanish.
Is it true?!

我在计划明年去西班牙和葡萄牙旅游，所以我要开始学西班牙语。我的吉他老师，是个语言爱好者，他说西班牙语发音对日本人来说并不难，而且葡萄牙语跟西班牙语很接近，葡萄牙人也听的懂西班牙语。真的假的？

Spanish is pronounced the same way it's written, but grammar and orthography is more difficult than English for example.

Both are Roman languages so they have things in common but that doesn't mean that studying Spanish you can understand Portuguese with no problem, and viceversa.