whats the secret? i dont really have a steady hand, or the space to put a table saw in me casa... so aside from visiting someone who has a table saw, how do you get the straightest cuts?

ive got some thin (bout 1/4" thick) oak i bought from lowes for another project i finished. i have a good chunk left over. i wanted to build a basic square canopy for my 10 gallon tank that i just set up.

can i take the wood back to lowes and pay them to cut it? i already have the wood glue to put it togeather, as well as primer and paint for the finished product.

many thanks for your advice!