turn off water at mains, or on isolator valves if they have been installed.
open taps
undo nut connecting taps, expect a bit of water
undo nut holding taps to the sink and remove taps.
replace with new taps, doing everything in the opposite.
If they are monoblock taps screw in the hoses first, then install on sink, should come with instructions for the fitting of the taps, read twice
Remember to replace the fibre washers on the taps connectors, make sure you take the old ones out and wipe any bits out of the ends.
Turn water back on, check for any leaks and tighten if necessary