You don't really need their toolkit to make the repair - most of the repair shops has the necessary tools already available for other phones.
The basic process of opening/closing any moder phone is basically the same.
The basic process of opening/closing any moder phone is basically the same.
And even if you did rip those tabs IPA does much better job of un-adhering the battery as you really don't want to use excessive force on lithium pouch cells unless you like your repair job to get "fast & furious" :-)
Yeah, IPA and thin plastic shim card. These are often sold in lockpicking shops for door shimming - costs few bucks. Or directly from iFixit site (/products/plastic-cards). Just snip it in half so it is not as wide (careful not to leave sharp corner that coud tear up that battery!). Then slip it under the battery and use it to guide few drops of IPA under there. Worked for me every time with almost no hassle.
Just be careful because IPA is of course flammable. If you would puncture the battery or make it spark, you could end up having quite a bad day. But that probably applies for the monofilament-under-the-battery approach too.