I bought Lemforder as we are likely to keep the car till scrap, but didn't buy both, stupidly, did eventually do both sides about 8 weeks apart.
There is a very good U tube video on how to remove the bumper, just google it(blue car), but note, the three small screws(inner wing guard) are really hard to remove and the ones underneath at the front that are fully exposed I had to cut a slot in to remove,-not the Torx head ones, use a new well fitting screwdriver bit really pushing it on to crack it off.
There's a small nut holding the inner guard on, I sheared one off so no huge forces also I replace all the Philips head screws with stainless steel.
There's a Torx head bolt at the wing edge spray lots of release oil on they too are a nightmare to get out, I snapped off the welded on nut in the process on one side, the video shows you just pull the bumper away, don't, with help and a bright light under the wing slide a flat blade screwdriver in opening the plastic clips, this way it easily comes away under control the bit nearest the engine needing a bit more care, the missing bolt does not effect the mounting of the bumper I've found.
You will need a big torque wrench a quality hex head sockets, most of the bolts will come out(some are really tight) but I'm glad I did it now not in a few years,, the bolt near the ball joint (which you get a new bolt with the Lemforder arm) will drive you 'nuts' trying to remove, I worked out to put the nut back on so the thread was level with the outer face of the nut, and with help hammer the end of the nut whilst turning the bolt head, hard to do on your own but just possible, tricky to get the new one in too. You also need to use a wedge to splay apart the mounting just above the bolt, I used a small cold chisel.
The front bolt on the control arm is recessed so a short extension is required, make sure you don't twist it off at an angle or you may chew up the large head, oh and you need 16/18mm sockets not ones I had in my set, mine were odds after 15mm.
Euro car parts have an offer on this weekend if you go for the Lemforder part now is the time to buy!
I have a Haynes manual it is a help so if you've not one might be handy?