Slightly too hard, but that is more because of how gridlocked Congress is than the method itself. Although 3/4 of state legislatures ratifying seems excessive to me even if it gets less attention as an issue.
If I was designing an amendment method, I'd keep the 2/3 of both houses of Congress.
However instead of 3/4 of state legislatures to ratify; I'd change that requirement to a national referendum; taken alongside the midterms or presidential election (whichever comes first).
In said referendum, both a majority of people and a majority of the states must vote in favour to ratify.
I like this idea. 2/3rds of both Houses triggers a national referendum is a good way to do it.