Installing a faucet requires working in cramped conditions. If you are also replacing the sink, install the faucet before installing the sink. Otherwise do what you can to make the worksite comfortable.
Braided supply tubes make the job easier. Buy tubes long enough to reach from the faucet to the stop valves. If there are no stop valves under the sink, now is a good time to install them.
Most people find single-handle faucets easier to use. Make sure the spout is the right length for your sink. A heavy, solid-brass unit will outlast a less expensive unit. The faucet should come with a warranty that includes the sprayer.
About 2 hours to install most faucets
Screwdriver, adjustable wrench, groove-joint pliers, basin wrench, putty knife
Shutting off water, working under a sink, attaching plumbing parts
Shut off the water and remove the drain trap
New faucet, plumber's putty, pipe-thread tape, masking tape