That sounds about right. Only don't take this too literally:
stick the tip of my tongue to the roof of my mouth
If I do that, it gets stuck. What I think you want is the hard palate (behind the teeth), not the top of the mouth, and keep it relaxed.
I guess I should add that I'm neither a native speaker (though I've studied more than one language with rolled r's) nor have I any experience teaching this skill. I'd bet money you can learn it, though.
Edit: one more thing - you may find it easier to try words that end in a rolled r. The words that begin with a rolled r are a little harder (to me).
stick the tip of my tongue to the roof of my mouth
If I do that, it gets stuck. What I think you want is the hard palate (behind the teeth), not the top of the mouth, and keep it relaxed.
I guess I should add that I'm neither a native speaker (though I've studied more than one language with rolled r's) nor have I any experience teaching this skill. I'd bet money you can learn it, though.
Edit: one more thing - you may find it easier to try words that end in a rolled r. The words that begin with a rolled r are a little harder (to me).