Changing a light switch isn't that hard, it's just 2 wires connected to a switch, just gotta turn off the breaker before you do.
As for cost, the smart switches don't look that much more expensive. Amazon sells the Caseta ones for $70, but I think you need a hub for them too.
https://www.amazon.ca/Lutron-Wireless-Lighting-Ceiling-P-PKG1W-WH-C/dp/B00MFM9ETO/ref=sr_1_4/131-2176032-3735445?ie=UTF8&qid=1542911593&sr=8-4&keywords=smart+switch+caseta