according my experience as a native arabic speaker i can tell the following:
it depends on your brain, and which level you want to reach
in speaking this language.
so if you want to reach an acceptable level just to communicate then it is very easy but whatever you tried you will still have problems in grammars since it is very difficult.
But if you want to reach experts level, then you really need to spend years in learning it.
.
.
.
Now i want to tell you that one of the privileges of arabic that it is very very very Rich language and you may find one thing has many names.
this richness give it flexibility and power at the same time.
.
..
Pronunciation:
i think you ll face difficulties in pronouncing some letters based on what nationality you have.
.
if you are european you will find letters like (K)af or (7)a2 difficult since you don't have them.
if you are turkish you will see that these letters easy for you.
.
if you are indian or philipino also you will face problems in Ra2 to be pronounced from the edge of the tongue not the bottom of the tongue like what indians do.
.
.
last we don't have "P" :just for the info :P
.
.
you are welcome and i hope my answer was sufficient.