Best way is to start and finish at the valve, the reason is you can push the valve stem in with you fingers which means the tube is also away from the rim so you dont nip the tube. Use rim protectors to avoid damage.

Before you take off the old tyre find the mark on the tyre wall (usually a red circle) which identifies the heaviest part of the tyre and make a chalk mark on the rim and line up the mark on the new tyre in the same place so the wheel is reasonably balenced. As mentioned earlier make sure both tyre rim sides directly opposite to where you are levering are in the WELL of the rim.

After refitting the tube BEFORE you start to lever the new tyre on add a little air to the tube and double check that the tube is now inside the tyre and not trapped between the tyre and rim. More air and a light bouncing of the wheel should correct this, then loosen the valve enough so it releases air when you are levering on the tyre. The standard inner tube is coated with a graphite lubricant but my new tubes are not, use talcum powder as a lube when fitting new tubes.

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