Remember to always wear protective glasses while trimming.
Gas or Electric?
Electric or gas powered and curved or straight-shaft and of course the brand, are probably your biggest trimmer decisions.
Gas model trimmers witll give you more flexibility, you don't have that cord to flip around the yard, but they are usually heavier than electric models and more expensive.
Electric string trimmers are light weight, quieter than gas models, but you do have the electric cord to contend with. If your yard is small, maybe the electric model is just right for you.
Curved-Shaft or Straight-Shaft?
Curved-shaft string trimmers tend to be shorter and can't get back into some areas and because of the short shaft. They can give you a back-ache if you use them for hours on end.
Straight-shaft string trimmers are what we recommend, their shaft is longer and therefore it is easier to get back into some areas and because of their length, they don't tend to give a person a back-ache as quickly as the curve-shaft trimmer.
Maintenance
Please see articles on right