Hi Pauline.
Two things to watch with these is high power on FM can cause them to get very hot. Even turned down, mine gets hot on long transmissions.
Usually ok with short tx or a few on channel on muppet band
(Heatsink) ssb tends to be ok with voice carried power.
The other thing is programmed radios.
These are fine but I quickly found out that by setting the frequency on channel, the frequency change gets stored.
I changed quite a few at first
Here's a handy link to Delboy's frequency charts for future reference.
https://delboyonline.blogspot.com/p/cb-radio-frequency-list.html
Good luck and happy dxing, hope the hills don't hinder you too much .