Find the right opportunity is too wide statement.

The truth is that a H1B worker is not a free worker in the free market. There are artificial restrictions on your person which not based on your skills, qualities or opportunities; they are based on political restrictions.

It is legal. Easy? Not as easy as it is for residents. You still need to get sponsored and you're not necessarily eligible for all job openings (Some require citizenship or green card). At least in my field that's how it is.

It costs four to eight thousand dollars assuming $2k in legal fees. That isn't easy.