Replacing Old Faucet ?

.......I need to replace an old faucet on the kitchen sink ! Being able to get under the sink so I can see what all is involved in removing the old sink looks to be very difficult since there isn't much room to maneauver . Besides , I'm old and fat so this is going to be even harder .
.......This is an old , single spout\handle that movies from side to side to change from hot to cold . Also , paying someone a $100 an hour is out as well . Anyone with prior experiences changing this item out like to provide advice ? , thanks , jf