Hmm...haven't done that one yet, either. I'd say start looking plenty in advance for what you're going to need to do for all of your visas. For many countries, you might have to send your passport away, then they mail it back. That could eat up a lot of time between now and August, if you need to do that multiple times.
If the countries you're planning on visiting have embassies/consulates in one city where you can do it in person, consider taking a day or two to walk around DC or wherever and do it all at once. That way you don't have to leave your passport or send it off.
Good luck, and keep us posted...
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