I'm looking at this job myself. My plan of attack will be to connect the new chain to old and pull it through so it is automatically routed through the bottom gears.

From what I've read it is a brave DIYer that installs the master link without the crimper. If the chain let's go the pistons go crashing into the valves which totally destroys the engine.

I assume you got a new chain like this:

http://www.pelicanparts.com/catalog/images/Connect-Images/0039978094-M48.jpg

Although I do see this same company sells a master link with a circlip that maybe negates the nee for the tool. I'd be interested if anybody has used that part without the tool with long term success:

http://www.pelicanparts.com/catalog/images/Connect-Images/0009973298-M48.jpg