Picture hanging

I have 3 x Framed pictures, 5 small letter tiles and a heart shaped item all to be hung on a wall on a single story home. I would do it but am terrible with ensuring they are centered correctly. A relatively easy task for a competent handy person. Appreciate if you can provide the 3 picture hooks the largest picture is 120 cms x 80 cms and weighs 1-1.5 kilos the other 2 are small and the tiles just need the little picture nails to sit on as would the heart.