I been shooting a S&W 4014 I got a month ago and the sights are awful.my rounds hit a foot below where I'm aiming. the sight isn't adjustable and I know next to nothing about guns. I know I'm aiming correctly. I use the 6:00 and my hits are dead on with my 1911, but with the other pistol I'm hitting my target in the toodles instead of center mass. what adjustable sight would be recommended for this? can I put it on myself or would a gunsmith be needed?