Most visa is easy if you qualify. Just make yourself a heavyweight.

For example, someone was asking me if it was incumbent on him or on his online Canadian girlfriend to show proof of sponsorship, since he was about to apply for a Canadian visa to visit her.

I told him that he would be rejected immediately if she was the one sponsoring him since it only shows how weak he is financially, and will most likely not come back.

I know it is hard to be an economic heavyweight in Nigeria, but that's what it is. But for EU countries, you don't have to prove that you are a heavyweight or will come back if you are going as a student since you are considered a future asset. The country will want you to stay.

But visit? forget it. Only really wealthy people right now can get a visit visa.