Paid around £4 for mine off ebay and did the job just fine
It is tight in there with the strut etc but certainly doable without any special tools!
Bolts on mine were very tight and one caliper was seized
turned into a nightmare job to be honest as then had to order a new genuine caliper in red off ebay and bleed system etc
Make sure you apply a dab of loctite to those spline bolts when refitting as last thing you want is those coming loose