LouisRoy has got it right--the biggest problem that self-taught guitarists have is with following a tempo--get a metronome and practive playing those chord changes in strict time--

A related problem that self-taught, solo guitarists often have(unless they've had formal training on another instrument) is that they play irregular numbers of beats and measures--16 measures the first time through, 15 1/2 the second time(often because there are less syllables in one verse than another), and maybe two measures between verses on time and three the next time--This habit makes it hard for other musicians to follow you, and can be deadly in the recording studio--

Third bad habit that self-taught musicians have is bad attack--meaning that they don't get a clean, solid, sound out of the instrument, and they don't have control of dynamics--


Fourth bad habit, which you have mentioned, is sloppy fingering--which really means that you don't segue between chords in a systematic and organized way so there is hestitation in some chord changes.

If you have a good teacher from the beginning(and it can be a friend or acquaintance who is doing it without compensation), you won't develop these bad habits--they are hard to recognize, hard to unlearn, and they hold you back--