All countertops, shower walls and sinks should be treated with a non-ammoniated cleaner or bleach to remove any contaminants; this allows the caulk to adhere properly. Assemble the fixture according to the manufacturer's instructions.
Once it has been securely fitted, make sure the area around the fixture is free of water or moisture in preparation for the sealant.
If the feed pipes for the water are made from copper, then you should not find much difficulty detaching them from the faucet fittings. However, sometimes these copper fittings have become rusty and old, and they may give you trouble when you attempt to unscrew them.

You need to take care to avoid this because you can cause damage to the piping if it takes too much effort for this removal. Clinton Hill Plumbing Heating and Cooling  plumbers are experienced in all areas of bathroom plumbing - everything from installations through to renovations and repairs.