I've got a Stihl MS181 and apart from the top cover coming loose, it's a fine machine. With a 14" bar you can technically cross cut 28" but felling anything large is a job for the professionals. Try lifting a 6" log that's 10' long - they're heavy and not to be taken lightly, pardon the pun.
As mentioned, get some PPE, at a minimum chainsaw trousers and a visor (with hearing protection). I wear gloves but they're more to protect my hands from handling the logs (they're sturdy leather ones, not chainsaw ones - if you are using a saw properly your hands should not be in danger). There are some excellent instruction videos on YouTube if you can't or won't get any formal tuition