Please can anyone give me simple instructions on how to ice a cake. I'm not talking anything fancy, but I just want to pipe a few swirls round the edge of a cake, or pipe a pattern on small cakes or biscuits. I've tried everything - those old fashioned piping tubes with two circles/holes at the sides and different nozzles (hurts my hands and icing gets stuck and ends up in a mess) icing bags that I see them use on The Bake Off with the greatest of ease. I can't work out how to make the nozzle stick on the end of the bag and another mess) some plastic sort of concertina bottles in various sizes with easy to use nozzles - thought I'd cracked it but only worked with fresh cream - with icing - same mess as usual!
I've tried fondant icing, ordinary icing made with water, butter cream but always ends is a mess.
Any advice would be appreciated.