If the cuthole is the same as your existing downlight, you can fix it up on your own. Video shows a Liniq LQ8001 round downlight. Safety first; do remember to off the electrical switch before tampering. If you need electrician's help, please contact us directly.
It is easy to replace the bulb for track holders. This video below shows ST800 track holder. You can follow the instructions to remove other models of track holders that uses the metal clip.