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Extension ladder. It's like the ladders that are on fire trucks, but much smaller and portable. You could carry it on your own. You can pick them up at Home Depot.

You could get a longer ladder too. The example I linked to is only a 20ft one. It is also rated for 225lbs. You said you're 200lbs, so you might look at getting a ladder that's rated for 250lbs... just to be safe.