depending on how deep the scratches are. for easy DIY solution, you may want to start with a polish. check out Auto Glym's super rasin polish or Carpro Essence. In the case of Essence, it will give you about 6 months of protection after polish. you can easily do that at home and by hand.
Carpro makes another product called Essence Plus, it has no abrasive and has fillers. if your scratches are fine enough, it may already be sufficient. also provide 6 months of ceramic protection by itself - you can layer it with other ceramic infused sealants for better/longer protection.
I am in Korea, Carpro is a local brand and fairly reasonable to obtain. In the UK, check out Anglewax - they make good stuff and should provide the best value for those in the UK.
I can go on for hours about this. happy to answer any further questions though.