You can definitely do it!!! Just increase the mileage slowly to avoid injury and you will be there. I was a none runner and started training for a charity run The Great North Run I trained for 7 month and done it.
Argos have the fr10 for £80 . I use the fr110 which I would recommend £99 on amazon ! I agree with Country Jim it does make it easier than phone and it definitely is a good tool to have to improve training runs!