Music Composers Unite!
"inspiration?" I am unfamiliar with the term.
Do you mean the ability to work in a concentrated way such that there is very little wasted effort, thus providing the illusion of seamless writing? Or do you mean that something outside of your being somehow by magic, influenced your efforts so that the oucome is better than you had a right to expect?
I wouldn't take the Handel story too seriously. He had composed largely the same piece of music a year or two previous to the Dublin work and had it and several other Messiah selections sitting on the shelf waiting for an opportunity.
Moreover, no less a composer than Beethoven said "I learn something from Handel everyday." I take that to mean that LVB thought Handels technical skills were supurb.
If you want to hear music of Handel that is much better than Messiah and borders on "magical" you might try his Opus 6.