Google "led retrofit kit" they are a bulb and housing in one that fit inside your existing cans.

You can buy LED bulbs that screw right in or you can get a retrofit kit as noted that will give a more sleek one piece look and are also relatively easy to install.

Check your existing CFL cans to see if the can has an integrated ballast.
If it does, the ballast needs to be disconnected.

If the bulb is not connected using an E26 base connector, it is likely that the can has an integrated ballast.

Then, you'd need to change the connector to a GU24 and use CR6/ CR4 like lamps which use a GU24 base connector.

Technically, a E26 base connector can be used, but that might not be allowed legally in your jurisdiction. For instance, California has very strict rules in Title 24.

If you decide to use an electrician's services, swapping out the can and light might be the recommended route.