based purely on information that i gained from the excellent danny boyle movie shallow grave, one of my favourite movies i would highly recommend watching it, one of the easiest ways to dispose of a body in a simple and professional manner involves a number of steps.
1. remove the bodys hands, feet, eyes and teeth all of these can be run through medical records and police databases to identify the body therefore making it significantly easier to trace the victims movements back to you.
2. dispose of the hands, feet, eyes and teeth seperatly to the rest of the corpse preferably using a fire. just to note though popular in television and film the pig and acid methods would likely not be practical in real life as no mainstream acids accesible to the public are strong enough to dissolve a human being particularly not through the bones without taking a significant amount of time and although pigs will eat almost anything most people do not own their own pigs and even then it would still likely take days for a pig to dispose of an entire corpse.
3. finally find an out of the way location miles from where u reside to bury the body. this is because it is impractical unless you already live in the middle of nowhere to dispose of the rest of the corpse using fire due to the smell it would create alerting the neighbours and the amount of time it would take to burn a corpse which though not massive would still provide time for witnesses.