The box is open, the bracket is on the wall, and the first night is not over yet. That is when most people learn the return clock started running the day they paid. Before you buy anything for the bathroom trip, read the clock first, because the test you need the product for is the one that happens in the dark.
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Find the start date and the length
Look for the clause that says when the return period begins. It may count from the purchase date, the delivery date, or the date of installation. Write down the start date and the last day to return, in the same format you use for the rest of your notes. Then ask whether a weekend or a holiday moves that last day.
Read what comes back to you
A return can mean a full refund, a store credit, or an exchange. Each leaves you with different money and different choices. Check whether you or the seller pays the return freight, whether an opened item is accepted, and whether a restocking deduction applies. Check whether a cut-to-size, custom, or special-order item is excluded. Those are the items most often sold as final.
Test the item on the route before the window closes
Set a test date well before the last return day. Install the item the way the instructions say, then walk the full bathroom trip at night, from bed to toilet and back, with the lights off, the way she walks it. Keep the box, the packing material, and the receipt until the test is done. If the product changes the route in a way you did not expect, the return clock is what gives you room to change your mind.
What to ask the seller and what to keep
Ask for the return policy in writing, not only the web page. Ask who handles a return when a product does not fit, and what they need from you to start one. Keep the reference number, the name of the person you spoke to, and the date of each call. Keep the packing slip and a copy of any terms you accepted.
For a general list of what to keep and where the facts in these notes come from, see the Sources page. If you have a question about your rights under a particular contract, a consumer protection office or an attorney in Missouri can answer it. That question belongs with them, not with the route.