If you batch prime, I believe that's usually around 80g sugar for an ale and maybe a bit higher for a lager. Dissolve it in a mug with a splash of boiling water, and gently stir that into the brew.
I'm probably going to upset a few people here, but I bottle from the primary FV using a large jug, through a tea strainer (to get rid of any floaters), through a bottling funnel, which has a short piece of silicone tubing attached and which reaches to the bottom of the bottle.
I dip the jug very gently into the FV so as not to stir up the sediment, then when I am getting down towards the bottom of the bucket I very gently pour the last few litres into the jug, getting almost all of the beer out of the bucket.
I never have any help with bottling, and am unable to be at both ends of a syphon tube at the same time, so this method works for me.