Pronunciation of Gli?
Is it pronounced like "lyi"? that's what it sounds like to me. Is that at least close to the sound?
It's probably the closest you can get with English phonetics, yes; it's a bit heavier inside words (e.g. foglia and aglio) and there you can approximate it with lly (many like to think of the word "million" spoken fast). Around Rome there's a phenomenon similar to the Spanish "yeísmo" and it becomes more of a y, but in standard Italian it's its own sound, [ʎ] in IPA.
L is pronounced using the tip of the tongue.
GL is pronounced by pressing the central part of the tongue against the hard palate, flattening it until its sides almost touch the molar teeth. By releasing it as you pronounce the vowel, you should get the correct sound of GL.
That's actually how I was doing it. I'm a kind of beginner to linguistics. This is far from the first time I've studied a language. So here's to hoping I'm doing it correctly.