The 'small things' you fix youself - get good at it. The major things the dealer or mfgr should fix (fridge, heater, elect system) ... again, get good at fixing (small repairs) your RV and you'll love it. Read the reviews (not the dealer sales/site reviews, but other reviews sites
Most are in reasonable shape, learn how to take care of it - because after the warrenty (such as it is) you'll need to fix minor issues. Leave major issues to the Pros. Just enjoy it ... pick a good one. Listen to RV.net about what you choose - ask questions, listen to the answers. Pick those posters that seem knowlegeable. Ignore the rest. Good luck...