Depending on where you bought it, seller-servicing ranges from excellent to incompetent. If you have a significant issue under warranty, then it probably makes sense to inquire about warranty servicing at the seller. For major issues out of warranty, there are capable independent techs out there, in case your seller isn't one that inspires confidence. For routine servicing and minor repairs, you can find instructional videos for about anything. Sometimes, diagnosing the problem is more challenging than the actual repair. Most air guns are not especially complicated, but they are different than firearms, and probably anything else in your experience. As with many things, time and money are usually considerations, and sometimes it just makes sense to figure it out yourself. Again, videos and inquiry on this forum will usually help.