When it comes down to actually welding, there are three things you need to do for good results: Get familiar with your machine, get comfortable, and practice. Even though all your welding chores won't be under ideal conditions, set yourself up at a metal bench with a stool that's comfortable to sit on and do your best to keep both hands on the gun and rest your elbows on the edge of the bench if possible. The more stable your hands are, the better your weld will turn out. Also, get your face close to your work so you can see what you are or are not doing right. Don't be scared of getting close to the weld, that's why you have all your safety gear. If you can't see what you are doing, you might as well close your eyes.
Practice, practice, practice! Go buy a bunch of remnant pieces of mild steel at your local metal yard and go nuts. This will help you get your machine dialed in and start building your skills. For more in depth information on specific welders, processes, and to buy any and all of the above, stop by your local welding supply store or get a hold of Miller Electric via the phone or their Web site. We can only talk about it here so much before you need to just get out there and do it yourself! CT
Once you've selected your wire thickness (on the wire speed dial) and your material thickness (on the voltage dial) you're set, and the blue Auto-Set light will come on. The Millermatic 140 is a 115-volt machine that is capable of welding 24-gauge to 3/16-inch mild steel in one pass, which would be plenty for most automotive chores since most factory frames are close to 1/8-inch thick. | 
Safety first! This is especially true when it comes to welding because we are dealing with high amounts of heat, light, sparks, and electricity. You don't want to wear your best cloths when MIG welding because there is a fair amount of sparks generated when laying down a nice bead. A decent helmet should be first on your list. You can choose between the standard flip-style helmets and the latest in auto-darkening, which has a lens in it that automatically darkens when an ark is struck. Your choice will depend on your budget and/or preference since one is not better than the other--they both will protect your face and eyes. For gloves, get a pair of thick, MIG-specific, good-fitting gloves as well as a pair of welding sleeves to protect your arms from nasty sunburns when not welding with a jacket on. All of these items can be had at a local welding supply or from Miller. | 
For any type of welding, being comfortable is the key to producing nice welds. Of course, you need to be able to see what you are doing (especially when learning) and you preferably need to hold the gun with both hands so you can steady it while welding, otherwise you'll be in for a ride. Getting an elbow on the table and your face where the action is will also help quite a bit. |