I will agree with Stabbey that the game is not as easy as a lot of people tries to say, especially in Tactician. Or rather, depending on your builds, it will be very hard, hard, or okay.
Tactician imo brings forwards everything that is wrong with DOS:EE by widening the gap between the abilities usefulness and generaly aggravating the game balancing issues. Sure, it is possible to stumble on the right builds by yourself, but it is easy to waste points, and points don't come in a large supply. You are tempted to put some points in Lockpicking : definitely don't. The talent was useless and is still useless. You may not have been tempted to put some points in Leadership, do it, but maybe not too many. Sneaking received a huge nerf compared to vanilla that may render it very useless too : you may have wanted to make a stealth based rogue based on your experience throughout other games, it may not be a good idea here.
All this make for a somewhat non intuitive and unforgiving Tactician experience especially in the first chapter. You may get enough skills and spent points later on that may help you even the odds, but chances are that you will suffer in Cyseal. Another thing that may require you know what you're doing is that it's very unadvised to wander out of town before having done everything you could - which should bring you to level ... 4 or 3?
And as Stabbey said : gather your team of 4. Don't even think about Lone Wolf for a very first attempt at Divinity : Original Sin Enhanced Edition session in Tactician mode.
