Just do it. Within reason, list your donations or whatever accurately, keep notes in your records, keep item assessments and mileage amounts etc. prudent, and call it a day and go to sleep and do not fret about it further. Do you really think you will be audited with a 30k-100k AGI and a few thou, or even tens of thou, of contributions? It is an honor system still to first order, and you will never ever be scrutinized over it. Hundreds for church/temple, hundreds for charity, hundreds in clothing, moderate amounts for mileage or whatever, a few hundreds for alum assns or do-good groups or pbs/scouts/schools/colleges etc etc etc, no worries. Just do it.
