How I did it: I have a set of ogham staves, but i didn’t use them for practice at first – i put three new letters a day into an Anki deck and then started pulling a stave every day once the deck was half-finished. And, of course, reviewed the deck every day.
I still need to count off some of the letters (‘muin, gort, ngeatal, straif…’) but i recognise most of them quickly enough.
It took me 2 weeks.
It made me