I know that the barrel on T3's are very difficult to remove. I have tried to spin two barrels off of T3's and they just did not want to unscrew, I put them in the lathe and made a relief cut just in front of the receiver. With the relief cut made the barrels spin off very easy so they must use a couple of big Finnish boys to torque those suckers down, maybe impact tooling. Since they spin off so nicely after the relief cut made tells me they do not use thread locker when installing the barrels at the factory. I assume your barrel will be difficult to remove, although I have not done one on your model.
Long story short, you will need some significant equipment to get the original barrel off, having a gunsmith remove the barrel would probably be far more cost effective. After the factory barrel is off you can then install barrels with Savage-style nuts if they make them for your flavor of Tikka.
Hope this helps,
wade