Small random-orbit or pad sanders make this job go faster. (Wallis first covers these boundaries with Synkoloid patching compound so no edge is visible after sanding.) As shown, you want to make sure that there is a feathered, smooth transition from exposed wood to old paint. For areas that might get close scrutiny, you can follow up with a 100- or 120-grit rubdown to erase any scratches.
Ceramic paint/coating is more of a gimmick (costing 3-4 times more than conventional paint job), marketed by national brands and local “premium” painting contractors. There has been no real testing done, to verify that Ceramic paint is in fact “lifetime”. Additionally, ceramic painting contractors define “lifetime” as it is beneficial to them, when WHEN a ceramic coating fails, these companies blame the homeowners for “lack of care and preventative maintenance”, and in many cases, refuse to do any warranty work. House Painting Broomfield Colorado