I reckon I've written about this before. Have a look around on the forum and see what you can find out.
Essentially, it's a whole lot easier to take the whole lot off the car and replace the leads one by one on the bench. Disconnect the coil lead from the coil end, plus all the individual plug ends. Unsnap the dissy cap clips and withdraw the whole lot up past the air box (which is worthwhile removing to give you more room). You'll need to split the corrugated protectors by removing the zip ties to enable you to remove and refit each lead. A strong tip - tie a piece of strong cord to the lead set before you pull it down through the inlet runnners and out the front. Tie it to the new set when you are ready to reinstall them and use the cord to carefully pull the lead set up past the runners. It's pr
***k of a job without.
AND, while you have it all on the bench, check the dissy HT posts under the cap. I'll bet you will find them covered with white crud. At the very least clean them up, or, better still, invest in a new dissy cap and rotor. it's money well spent, especially since it's all there in front of you..