Check compression on the engine. Can pull the spark plugs and take a look at those too. Google ‘what to look for before buying an outboard’ and you’ll find good tips for the average person. For the hull, start in the lowest point, the bilge and go up from there. If something isn’t maintained, it might have been a bit neglected (electrical, scuppers, anything). Check everything on the trailer too if there is one, anything that needs replacement adds up quick. Before taking a trailer far, grease the bearings well, and pull over and check the heat periodically before getting on a highway. I’ve bought a couple boats without a survey, but definitely get a water trial and open the engine up to full throttle. Check the oil gauge that it doesn’t drop low, and the temperature gauge that it doesn’t get too high. Listen for any odd knocking in the engine. If it’s too pricey, get the survey for peace of mind, but if it’s most of the way there, anything can be fixed.