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This process makes that as simple as possible, keeping in the spirit of 5e. Step one: Come up with your homebrew spell and have it approved by the DM. Step two: Start working. Work consists of a full adventuring day at least 8 hours working on the spell. Markdown if you are successful or not. Step three: Repeat to result. The process mimics the mechanics of Death Saving Throws.
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Each day you make a check and mark success or failure. This is probably more reasonable but won't fit into the timescale of some campaigns. This is probably the most "realistic" but only works if considerable downtime is a frequent part of your play. Abilities: Why not let martial characters have some fun too?
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Present this new ability is a class feature. Would you get it at level 3? DC I realize this could result in a DC 35 check but, inventing a new level 20 ability seems like a godly feat so, I think it's fitting. I would Snak using the same guidelines as the spells, but use the "class level you would reward this ability at" idea in place of spell level.
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For abilities, they can either gain the ability for free or replace an equivalent ability depending on your power scale. For something simple like a new fighting style, a replacement would make the most sense. And that's it!
Hope you find these ideas helpful and would love to hear if you put them into your game! On 3 successes, make the spell. Three fails, you must wait a week to try again.]
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