The last percent will take almost as long as the previous stages. It's highly understandable that you'd like to get it finished as soon as possible but the last (five) percent(s) make 95% of the first impression of a random viewer!
Get into the right mood for each task left, do only the amount you can before your hands start trembling, take a deep breath every once in awhile, flex and relax your hands... Concentrate on what you're doing and when the first symptom of fatigue hits, take a rest and continue when you really feel like it. If in any doubt stop immediately and take another look the next day - or week! Look at it, play it, feel it and if you find anything that makes you uncertain, make a note and check if you can reproduce the bugging the next day. Recarving the neck even with the strings on is totally acceptable if you need to. Same goes with the entire build, if you find out that some corner makes your playing position awkward you can simply reshape it. An oild finish is very easy and forgiving to fix, any patches simply blend in.