All you have to do is edit /etc/network/interfaces and change:
iface eth0 inet dhcp
to:
iface eth0 inet static
address 10.10.10.2
netmask 255.255.255.0
network 10.10.10.0
broadcast 10.10.10.255
gateway 10.10.10.1
address 10.10.10.2
netmask 255.255.255.0
network 10.10.10.0
broadcast 10.10.10.255
gateway 10.10.10.1
Of course it is possible to uninstall dhclient, but I wouldn’t advise it because it can be useful in the future.