Guitar strings are going to snap, this is a fact. Every beginning strummer is going to break more strings than they would have imagined. While this can be a symptom of strings that simply are cheap, it is also common to those learning to play and how hard they play the guitar. When new to strumming, it is not necessarily a bad idea to buy cheaper strings knowing that the combination of newness and lesser quality is going to mean more broken strings. Even seasoned pros are going to have this problem and both acoustic and electric guitar strings are subject to this, it is part of playing the guitar.
Learning how to restring, whether a new Fender or used cheap acoustic guitar, is as important as developing the skills needed to play well. Here is a primer on how to restring an acoustic instrument. The tools needed are two sets of strings, some pliers and wire cutters. The reason for having two string sets is the real probability of the newbie tightening a string way too much, especially the E string, and watching it snap, almost immediately. Step one is loosening all of the strings completely, much like the technique for lowering the guitar's pitch. After this is complete, the pegs need to come off of the bottom of each string and this is where the pliers come in. It is very difficult to get the pegs off of acoustic models with just the hands. Once the bottoms are off, the tops are almost a piece of cake, except when someone has tightened these far too much; then it's time to grab the wire cutters.
After the above is taken care, the actual replacement of the strings starts. The higher strings go first, especially since the highest E is the one most likely to break. Take the bottom string hoop and put it over the hole for the peg. Put the peg in firmly but gently and run the top of the string through the tuners on the guitar's top. Take care not to tighten over exuberantly, just enough to get a bit of the proper pitch. Most times there will be some extra string and again, grab those wire cutters and snip it off. Once everything is properly in place, tuning the guitar is a matter of small adjustments.
Restringing a guitar is not a quick job, especially acoustics, but as with all things, practice makes perfect. As one gets better, invest in higher quality strings and this job will be needed less frequently. Better strings mean better sounds and less hassle.