You might be able to get away with that without messing anything up (kick the chrom/metal or marr it up). However, the special tool is just a spanner wrench and you coul prollie go to about any dealer and pick one up cheap. Or check e-bay, they shouldn't be difficult to track down.
If you have a fair ammount of strength, use both hands and adjust it that way. I was able to move it one setting (with the bike weight on the suspension :bang head: ) and another setting once the bike was on the center stand. Any more and I'll definitly need the damn tool.