Most systems can be installed in 1-2 hours with basic tools.
Most under-sink filters are DIY-friendly. You don't need plumbing experience, just basic comfort with tools and following instructions.
Locate the cold water shutoff valve under the sink. Turn clockwise to close. Open the faucet to release pressure.
If your system includes a dedicated faucet: use the existing sprayer hole or drill a new hole. Insert faucet from above, secure from below with included hardware.
Most filters mount to the cabinet wall. Position where you can easily change filters. Use included screws or brackets.
Disconnect the cold water supply line from the faucet. Install the T-adapter or saddle valve (included with system). Connect supply line to filter inlet.
Run tubing from filter outlet to dedicated faucet (or back to main faucet if inline system).
Turn water back on. Run water through the new filter for 5-10 minutes (or per manufacturer instructions) to flush carbon fines and manufacturing residue.
Place paper towels under all connections. Run water for a few minutes. Check for any drips. Tighten connections if needed.