[yorwba]

You may very well pronounce them without a glottal stop. If you whisper the words, you might be able to hear it as a click in your throat.

[graeme]

I tried that and I sounded a bit like an exaggerated latin accent from a movie. Sort of like a faintly pronounced h in front. Is that a glottal stop?

[fouronnes3]

No it's not like the initial h in 'hospital' at all. It's closer to you pronounce the 't' in 'batman' with a Boston accent.