From what they said, dont bother taking it to them lol. Torsion bar?
How do they know it will be difficult, if they dont even know your suspension set-up lol.
If no-one helps you mate, and you decide to do it your self, then just take it step by step. Its all pretty straight forward and nothing can really go wrong. As i said before, hardest parts are getting off the nuts. By a cheapy £15 impact gun and it a piece of pi$$. Will also need the spring clamps for when you have it out, attach and then unto the nut on the top. Wont need it for the new ones though i dont think.
And then the only other slightly challenging part would be lining up the 2 holes at the bottom of the strut. Just moe the disk a little bit in the right direction etc..... i found it easy the first time i did it. Just take your time.