1989 Ranger 2.3L

I' replacing the rear main seal along with other stuff this coming weekend and was wondering if I can do the seal without any special tools? It sounds like it's a good idea but sounds like it is do-able without it.

 

See this:
Ford 2.3l / 3.0l / 4.0l rear main seal installer tool .: Articles

And note:
Some of the changes to the motor over the years were:
Rear main seal changed from a two piece to a one piece design in ’86.
Roller cams were installed from ’89 on in Rangers and ’91 on in Mustangs.
Crankshaft main journal sizes were reduced starting in ’88.
CPS (Cam Position Sensor) was added starting in ’95 (’94 in California). At this time Ford changed to a 104-pin computer (it was a 60-pin) and moved the DIS functions into the computer, previously the DIS system had a TFI module as a separate unit mounted on the front of the intake manifold.
from:
2.0/2.3/2.5L Family - The Ranger Station Forums

Where there is a pretty good write up if you need more specs.
tom