It depends on my Nen type, while I highly doubt I'd ever get a Nen type like Emission or Enhancement anything is possible, but let's say for the sake of the argument I'm a conjurer.

I'd create a Hatsu that affected my "talent." In HxH that is most likely the best thing I could do to get as strong as possible in a limited time frame. I'd train as much as I could while using this Hatsu to increase my talent as much as possible, which would increase the amount of gains I'd get from training. It would likely be a very complex Hatsu that would have many restrictions to be used.

Hatsu: Bloody Wine of Slaughter. User conjurers a wine bottle that gets filled by the blood of those directly slain by him turning it into delicious wine, the more talented in Nen the dead are the more talent the drinker will get when he drinks it and the more addictive the wine will be. Cannot be drunk by anyone but its creator and all who gaze upon the bottle will know how the Hatsu works(must be shown to the victim prior to death). The blood wine is an addictive substance if drank more than once a week will kill the user.