For years I couldn't play SRPG's. I found them entirely too cumbersome, grindy and complicated. However eventually I found 2 'simple' games that I'd call SRPG lite and will help you familiarise with the genre.
The first game is one already been mentioner several times. Valkyria Chronicles. It teaches you tacrics in small steps and stages and the difficulty is pretty easy, bar a sudden spike in chapter 7, but that was trial and error. Preparing appropriately beforehand can trivialise it. There's not really any grinding or farming for loot. You don't need to worry about cross class skills or leveling individual characters since it's the class you level instead. For max rank it's based on speed and not how many enemies you take out. It eases you in with a semi realtime movement and aiming system to gradually familiarise yourself. The story and characters may seem simple, but it's also prety endearing. I honestly can't recommend this game enough.
The other game is on the DS. Valkyrie Profile Covenant of the Plume. This was actually the game that got me into SRPG's. As a Valkyrie Profile fan, it kind of forced me to try it. One reason this is so beginnger friendly is that the number of units are small. You only get 4, so there is so much less to micromanage compared to other games which can have well into double figures and more. While there isn't a difficult mode per say, there's 3 paths in the game depending on how much you use a certain game mechanic. The more you use it, the easier it gets but it locks you out of the good (hard) ending, but NG+ is there for you to try your hand at them all. Nothing overly complicated and the Valkyrie Profile battle system transitioned surprisingly well at times. Again no grinding, farming or spending an age on various subsystems to improve your units.
There are other games I find awesome like FF Tactics and Tactics Ogre. But I wouldn't recommend them to newcomers at all. So many random systems from classes skills that optimisation is an annoyance. People set up auto grinding loops for both games because of how awkward it is, which is a shame since the games themselves are fantastic. Both Valkyria Chronicles and Valkyrie Profile CotP let you simply play and never worry about levelling, farming or any of that stuff