I have not done gracilis, but it should not be hard. Is this your first seed?
Nepenthes seed seem more prone too fungus than other cp seed, in my limited experience. I have had seed germinate on milled sphagnum and peat/sand. A popular substrate by a UK friend of mine is perlite/vermiculite. It is more inert than the organic compounds, sp less prone to fungus probably. make sure you soak the perlite and vermiculite to leach any salts/unwanteds.
After than, warm, humid conditions(a baggie works) and bright, non-direct light and you should have germination, if the seed is fresh.
regards,
Joe