If you've experienced something before, there are several synonyms for the common phrase "been there." You can say "done that," meaning you've already completed the task or activity. Another option is "been through it," indicating that you've gone through a particular experience or situation. You can also use the phrase "been around the block," implying that you've been through something several times and are familiar with it. Alternatively, you can say "familiar with that territory" if you're knowledgeable about a particular situation. Finally, you can say "know the drill" if you're familiar with the steps required for a specific task.