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The timing marks are probably long gone.  Even if they are there it is unlikely they are lined
up with the timing marks.  You can remark the belt with a Paint Pen-available at Michaels
The Special Service Tool (SST)
bolts onto the crankshaft pulley
and the handle then fits the tool
and is attached with a clevis pin.
 Tool available at SPX Toyota
tools.  Not too expensive.   
Some write ups (non Lexus)
suggest you just use an impact
driver.   I would not take an
impact driver to this motor-but
thats just me.
This is the tool put together
and bolted to crankshaft
pulley along with a breaker
bar.  I had to use an
extension (handle from my
floor jack) to get enough
leverage to free the bolt.