This is what i use.
Square
Tape Measure
Countersink bit for countersinking the screws
Drillbit for predrilling
Wood glue
1-1/4" Drywall screws (these come out after the glue is dried)
Bar or pipe clamps
Table saw or circ saw
Router with upcut bit
Jasper Jig
Now if you dont have/cant afford to buy a router and Jasper jig you can cut the holes with a jig saw, they wont be perfect but they will work just fine. Be creative and use the tools you have. Also I cant stress enough to people, USE YOUR RESOURCES....friends, mom, dad, their friends. Somebody has the tools you need.