In the early 1960's macrons were the death of me. I couldn't remember more than a few of them, and really didn't consider them very important since they weren't present in the original texts, However I lost a mark for every missing macron. Nowadays, except for Wheelock which is a very old text, macrons don't seem to be such an issue, and when I came to brush up on my Latin, no marks were deducted for missing macrons. By and large I'd say don't sweat it, but do read the text aloud to yourself to get a feeling for the rhythm indicated by the stress marks. IMO, that will stand you in good stead. I can still hack out Latin after a fashion, and translate monuments.