Spelling comes naturally to me. I didn't do any phonics teaching in lockdown but am quite familiar with it as we moved country when DS was just 5 so I continued his nursery phonics from then on and started him off reading. I then used it as an English teacher. There are a lot of American phonics resources online and they teach the letter sounds in a different way which can be confusing.
No, I didn't struggle with explaining the ie before e rule, because I haven't taught it that way. It's confusing and not particularly helpful. Actually ie/ei is the one spelling issue that tends to trip me up, I think because in phonics, ie and ei can both make several different sounds, many of which are interchangeable.
ie can make all these sounds:
pie - eye
piece - ee
ei can make these sounds:
neighbour - ay
Eileen - eye
ceiling - ee
e i or i e can also be two sounds stuck together - and since e can be eh, ee or schwa (uh), and i can make ih, eye, ee or schwa, again you can get several combinations which sound the same. For example, weird. (ee-uh)
When it's clear what each sound is and you couldn't reverse it, you generally won't get the spelling wrong and so you don't need the rhyme.
Being - you couldn't write bieng - that couldn't be pronounced bee-ing, because e never makes ih. Likewise, nieghbour says nee-bour because ie doesn't make the sound ay.
But weird could be spelt wierd, ceiling could be cieling, pie pei, and so on.
If ei is making an ei sound, or an e is making an eh next to an i or an i is making an eye or ih sound next to an e, you generally won't misspell it.
When an ee, eye or schwa sound is present misspelling is likely.
I don't judge people for bad spelling but it does jar because it looks and sometimes sounds wrong in my head.