On Sat, 20 Jul 2019 17:20:30 -0400, Clare Snyder
wrote:

On Sat, 20 Jul 2019 10:27:52 -0700 (PDT), A K
wrote:

I want to mount this piece of plywood in such a way that it is reasonable removable.

I first need to true up the edges of the wood and that is difficult because of it's small size.

I have a table saw, circular saw, and reciprocating saw.

I would like to avoid the table saw because of its weight and bulk.

How can I true up the wood?

https://imgur.com/iFZFKs8
With the table saw. No other tool you own will do as good a job, as
easily , quickly, and safely, as the table saw with a good fence and a
good miter slide. A sled would be even better, but not a REQUIREMENT

A sled is certainly the way to go with small pieces and if you ever
think you will do it again, ever, make a nice sled with locking clamps
on it. The 20 minutes you take making the sled will be paid back a
thousand times my the fingers you don't lose and the work you can
accomplish.