Way late but... I'd use a dedicated anonymous OS on a thumbdrive, like "Tails", and some coffee shop wifi like already suggested. Dedicated anon email service too of course. That combo should ensure you're not flubbing some basic giveaways in your browser or OS that will finger you. Dedicated LE investigation might get the wifi location, date & time, then pull security cam vids but you'd have to be causing serious trouble to justify that. Easy to defeat with a disguise, cash-only payments, and accessing the wifi from a neighboring business instead of right in the shop but now we're in paranoid crazyland, lol.
Scrubbing pics: Best method I've come up with is to view the pic with one app (browser or pdf viewer) and then do a selective screen capture of the pic (which copies pixels only), paste it in a fresh canvas of some unrelated photo editing app or even MSPaint or whatever, then finally examine the EXIF data to ensure it's basically blank (it should be -- no fresh GPS, author, or other info being inserted) and you're home free.
Most peeps will be satisfied to edit or scrub the EXIF in some manner, whether in the app or with a utility, but in that case you're still trusting that no new data standards have slipped something through that filter, or that previous revisions in the document aren't preserved somehow (an editing history), etc. This is the whole blacklist vs. whitelist concept -- the former is essentially whack-a-mole and always fails in the long run... it requires omniscience on the part of the user in a world of ever-changing and growing complexity.
