…Reach behind and hook your bra.
This is the challenging part - particularly if done around back.
I find that by folding the bra tab with the eyes back away at the desired row of eyes, the eyes are exposed and much easier to catch with the corresponding hook. Then hook one at a time working from bottom up or top hook down. Part of the trick is in keeping just enough tension so as to keep the first hook connected as you work on the next. Once all are hooked, I run my finger under the join to smooth and tuck in any folded label.
It does take practice and these little details are not particularly intuitive - but helped me a lot.