Unfortunately finding someone to teach you to fly an ultralight is not always easy. The best source to find someone to teach you to fly an ultralight is the EAA sport pilot flight instructor list. You can use the list to find a CFI that is using an ultralight-like aircraft. The list is searchable by state, here is the link, http://www.sportpilot.org/instructors/
EAA has a great publication for anyone interested in learning to fly ultralights at this link, http://www.eaa.org/ultralights/fixed_wing_training.pdf
Having flown and owned both Cessna type and ultralight type, in my opinion ultralight flying is as safe as other general aviation flying, in some cases it is safer. Good flight training, conservative decision making and proper maintenance on your vehicle are key components to safely operating an ultralight vehicle. In the event of an off field landing I would rather be landing at 27mph than the higher landing speeds of heavier faster aircraft. Flying ultralights is interactive hands on stick and rudder flying.
Part 103 is a great regulation for those that embrace freedom, coupled with personal responsibility. Part 103 can be printed on 1 piece of paper. The simplistic basis of ultralight flying makes it the least expensive form of manned powered flight! LONG LIVE PART 103!
Timm