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Yes, you can technically use a utility knife or straight blade to cut through PEX pipe. However, this isn't an ideal method simply because you won't get the same clean cut that you'll get with a pipe cutter. A utility knife will likely create angles that weaken your push connections. If you use a utility knife, score the pipe with the knife along your marked line several times before making your final cut.

You should not attempt to snake your sewer yourself. Accessing and snaking your sewer requires heavy-duty equipment, and while renting is possible, misusing it can damage your sewer main and leave you with very expensive repair costs, not to mention potential environmental issues and severe water damage. Accessing your sewer also exposes you to hazardous sewer gasses, and failing to seal the sewer properly after work can be very dangerous. It’s always best to hire a professional sewer cleaner near you to handle this type of work.

A standard toilet flange should fit snugly into the outflow pipe and sit level with the subfloor. Installing a new one without first removing the old one will make it impossible to form a seal and keep the toilet bowl bolted securely in place. 

However, if you’re dealing with leakage or wobbling because you’ve installed a new type of bathroom tile (making the floor taller), you may be able to avoid fully replacing the flange by opting for a toilet flange extender. Extenders typically come in kits for easy DIY installation, fit over the existing flange, and bring the drain connection higher.

Sometimes a leaky faucet is simply the fault of a washer gone bad. Follow these steps to change the washer:

• Shut off the water to the faucet

• Remove the screw and handle

• Remove the packing nut and washers

• Clean and replace washers 

• Reinstall the packing nut and handle