I was careless about saving the game manually for a while but started putting more effort into doing it right and I've been making great progress.

Then play from there repeatedly until you get to another point where you know you haven't made any mistakes, and just do that over and over until it's over. Every time you get to a spot where you know you haven't made any mistakes and save it (about every fee minutes). The thing that I found to help a ton was to constantly save your progress as you go along. That would work (do I have to redo all the char missions?) So far I've gotten to about 63% but have not had a lot of time to dedicate to it between work.Д«ut anyway, the best strategy I've found so far is not so much gameplay related. I have about 5 hours or so invested in it as of now and I would hate to have to go back and take a different path. You aren't going to leave your base anyway (not with units that don't fly that is.) They do not have enough HP or surface area to repair. Also, keeping a building alive is much easier against her because they have tons of HP and huge surface area to repairДon't use supply Depots at your choke. She will spend her energy doing an AoE to the building and not doing it to your units. This makes units like BCs more cost effective because they can get out of the way.Д«uildings work great at attracting Kerrigan's focus. Tanks don't work so well because Kerrigan's area of effect attack can easily clean out 4-5 tanks and there's not much you can do. It will end up costing you the mission in the long run. If you ever lose too many key units or structures (especially in the beginning), reload from the last save. Just before the Leviathan shows up, start cranking out some vikings to deal. The blast has limited range, and you want to wait for the next wave of flyers/worms that quickly follows her. Though don't Nova blast too soon when Kerrigan shows up.

If Kerrigan or the Leviathan isn't around when you needed to nova blast, then it's likely that you need to reload a recent save. It will decimate you otherwise because it constantly spawns Mutalisks and Broodlords Save a Nova blast for when the Leviathan attacks. Make sure you have mind control energy when the big ultra push happens toward the end of the mission. Mind controlled units will NOT be affected by the nova blast (lulz) Especially if you have medics there to heal them.Д«uild a mind control tower and turret behind your mineral line to mind control brood lords that attack from behind.

Mind controlling Ultralisks is amazing too. Broodlords are imba and you want to make use of the infinite infantry they can provide. Use mind controls towers to grab as many brood lords and Ultralisks as you can. Build them early on the left and the right sides. Get as many ship and infantry upgrades as you can. If you didn't get flame towers, build a few planetary fortresses at the chokes and have a bunch of SCVs there to auto-repair (no seriously, it'll work, lots of HP, lots of splash damage).Д¬onstruct a few flame towers sporadically in your base to deal with random drop pods.Д¬onstruct Barracks at each choke point to serve as a wall between incoming enemies. You need them for repair and to keep up with the mineral gathering.Д¬onstruct flame towers near the choke. Trust me, I had the research that lets me train 2 SCVs at once, and I NEVER stopped building them.

Build them early.Д«uild, and never stop building, SCVs. Take out the Nydus worms as flying units are easy to deal withД«uild BCs to make use of Yamato cannon on Kerrigan and the Leviathan (the giant flying guy).Д«uild Marines and medics make use of stim.Д«uild a few Science Vessels to help with healing your BCs. If you lose too many units (like 3 BCs to Kerrigans stupid magic hand wave instakill bull), then reload. Save before Kerrigan shows up and after she retreats. Again, there are probably infinite ways to do it, but here is how I did it:

Wings of liberty brutal