First of all, I would like to say that intelligence is not to be measured by lace knitting patterns!
Lace knitting requires 100% of your attention, and speaking for myself, those first couple pattern repeats are usually a bit of a pain cause you need to divide your attention to what you are doing, verses the pattern.
You may never completely memorize a pattern, but knowing the groove helps A LOT!
With pieces that are done in completely lace (I mean to say, a pattern that is lace throughout rather than a pieces that has sections of yarn overs and others that are plain knitting like a garment - vs a shawl) then you are bound to do frogging. At some point the phone will ring, or there will be someone at the door, or a playful kitten or a distraction in any form, and you will not remember where you were, or have dropped a stitch, and you will need to frog.
My best advice, life lines, patience and as little distraction as possible. All will be...better! And as Lissaplus2 would say...chocolate!