The problem with bottling from a primary or secondary instead of using a bottling bucket, is that since you have patiently gone and let your beer settle and clear, in order to mix the priming solution and beer effectively
, you would have to stir it in the carboy..which would a) kick up all that nice sediment you have patiently let fall, b) possibly oxydize the beer.
Go to a hardware store and get a translucent or white bucket...but look for one where the 5 gallon mark falls way below the top of the bucket. Usually it will say 5 gallons at 3rd band from the top. (oh get the lid too....I totally regret not getting it when I did.)
Then get a spigot and make a dedicated bottling bucket. It really defeats the purpose of both a long primary/no secondary or a secondary if you have to stir up all the nice sediment you patiently waited to settle just so you can have consistent carbonation.
Mine is the translucent Leaktite brand 5 gallon container with the gallon and liter markings from Homedepot.
Here's a pic of mine from my bottling thread.
If you can't find a spigot today, then rack to the bucket and fill the bottles with the autosiphon, if that's what you wanna do, but you really should move it to a vessel where you can evenly integrate the priming solution and the beer.
But if you try driectly from the primary/seconday you will have unsatisfactory results and possibly even cardboard tasting beer.