It's a pretty easy job. I've done a few. I'd charge somebody about $30 to do it, if they were nearby.
You definetly want to catch a stud. I don't like stud finders.
Here's my way.... Find an electrical outlet, take off the wallplate, the electrical box is always on a stud,stud is normally to the left, make a pencil mark indicating the center of that stud,measure off of it,there is a stud every 16 inches (on center), it's marked in red on your tape measure at 16,32,48,64,etc. This rarely fails,I trust it more than a finder.
If no drill, you can use lag bolts and a ratchet.