If you are bottle conditioning beer or cider and priming for a secondary bottle fermentation to give it the fizz, I'm afraid a bit of sediment is unavoidable and is part and parcel of the brewing process. If you buy any bottle conditioned beers from the supermarket (although there are relatively few available) they will also have a sediment.
You can reduce the amount of sediment by giving your beer a bit longer in the bucket than the kit instructions tell you so that it has already started to clear a bit, or by using finings.
If the beer is then given a week in a warm place followed by a month in a cooler place, that sediment will form and start to compact. The longer you leave it, the more solid that sediment should get, and you should then be able to pour almost the entire bottle without stirring it up.
When you serve the beer, pour it gently and in one steady movement into an oversized jug, stopping pouring just as the sediment reaches the bottle neck, and then serve your beer from that jug.
Some people stir it up deliberately and will say that a bit of yeast is good for you. Too much might give you the squits though.