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This means a drift used must be within the 0.5 mm or so of the bush diameter with a recess in order avoid damaging the bush during fitting. Removal is not so critical as its buggered anyway. ......
I pressed out the old bushes from my Senator's wishbones. I had the facilities & materials at work at the time to make suitable tooling to press them out. But as you say, because these wishbones are only pressed fabrications and welded here & there, they are very easily bent. I'd to make do-nuts to go underneath to support the wishbone while I pressed the bushes in and out. That was years ago & the drifts & 'do-nuts' are long gone. 
...and yes i'd forgotton bending the wishbone.
With hindsight would you repeat the process with the risks involved, or buy the complete unit? also baring in mind Mr Hagon will be paying a labour hourly rate possibly.
Having said all that, as Kevin said earlier, Dazzler pressed his, so doable, but cost effective when your paying a garage? And i believe Kevin would have pressed a spare set of wishbones, then only fitted them once happy they where correct.