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It is not hard. But there is the easy way and the pro way. They make saddle valves that self pierce the waterline as a kit with copper tubing. It is easy to do. Now, while the kit is available from any home center and, rather easy to install. I don’t always trust the reliability of those values. I always prefer hiring a plumber who can tap in a real valve in the line with a proper shut-off in the event of an emergency.