What is the best way to replace the clutch in the tdr125

Get the service manual, or the parts diagram from yamaha. Drain oil remove pressure plate bolts four to six w/ springs under them. Lay the plates out exactly the way they came out. Watch for inside friction plate/ some bikes this plate is diff. or has an anti-rattle spring (pay att.) Check metal plates for overheating/bluing, if not warped can be bead blasted to remove color/burnt friction plate material If O.K> then replace friction plates and new springs and go