If you partially inflate the tube, it's easy to get the valve stem through the rim, without fancy tools.Another hassle with changing a tire for me has always been getting your tube valve stem through the rim. How to grab the darn thing... Get a valve stem snake screws on the top of your valve stem and poke it thru the rim hole before mounting. Once mounted, voila! Easy to get it pulled into place and rim nut on it.
Also reduces the chance of pinch-punctures from spooning on the new tire.If you partially inflate the tube, it's easy to get the valve stem through the rim, without fancy tools.
I bought a valve-stem tool a few years ago and found it more of a pain than a help.