If you are careful, you can replace a main spring without taking the side plate off, however it must be removed to replace the rebound spring.
If you are going to make this a one shot deal, you do not need to buy the special tool from Brownell's, and yes you can use a screwdriver. Just keep your eyes out for where the spring flies (lol).
If this is a Target Only gun, replacing the rebound spring and lightening up the main spring will make your gun's trigger lighter. I personally don't like to monkey with a Carry Gun's springs, I just prefer "cleaning it up". What I do is instead of replacing the main spring, I remove a little metal from the tension screw, then reshape it to the original tip shape. I would suggest doing this with a new screw and leave the original one full length. You can get new ones from S&W, Brownells, etc. This way if you screw up or go to far, you will still have the original. Get a few while your at it, they are cheap enough. You don't have to remove all that much for a noticeable improvement in the trigger pull.
Very easy job, just take your time.
Regards,
chief38
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