Getting the low compression in the cylinder fixed all by yourself is a challenging task to undertake. It takes a lot of time and effort as well. In order to get better results in fixing it, you must pay attention to troubleshooting as well. There are various reasons why low compression occurs but the main points or parts you could refer to are the piston/piston rings, timing belt, valves. These elements in the engine will help you in your search for the root cause of the problem. Getting the job done on your own may be quite tedious. On the other hand, if the issue is not entirely fixed and is beyond your own capability to fix, calling a professional to resolve the problem may also be a good option. But also to an extent, you have to be willing to spend bucks since repair and replacement of parts are costly as well.