Wotcha and welcome - TDR are a reputable place to get work done.
The work you have asked them to do is time consuming - that is also assuming all of the nuts / bolts come away and don't need cutting off - I recently did ARB drop links on my car - each one took 3 hours!!! 2 hours 55 minutes of attacks with plus gas, blow torch, hacksaw and dremmel cutting & grinding discs (you couldn't get an angle grinder into the space).
Are you replacing the bushes at the same time as these will need to be swapped from old to new as well - again assumption that the OEM ones are still fit for purpose and will fit the new items e.g. the ARB thickness, are you replacing like for like or are they thicker diameter?