Be sure to check two things: fermentation finish, using the hydrometer, and also clarity. The wine can finish fermenting and still not be ready to bottle. I disdain sediment in my bottles, so if I can't shine a flashlight through it and have the lens look clear and sharp through the carboy, it is not ready yet. A flashlight will show up sediment and haze well!
When fermentation is done and the wine is ready to bottle, I always stabilize with a scant 1/4 tsp potassium metabisulfite and 2-1/2 tsp potassium sorbate per 5 gallons, then wait 3-5 days under airlock to be sure it is finished.
The k meta will innoculate against infection as you transfer, bottle and store, and the sorbate will help preserve the wine in the bottle as well as guarding against additional fermentation should you decide to backsweeten prior to bottling.
The cost of these items is negligable compared to the value of peace of mind, and I have never had a popped cork or exploded bottle. While I have been able through sanitation to skip k meta doses while racking, I never miss the one just prior to bottling.