No you wont have to take off the bonnet to fit them. They look similar to the TEIN ones i just fitted.
The bracket you see thats already attached looks like it goes under the bolts holding the bonnet to its hinge. Should just be a case of removing the nuts, sliding the bracket over the theads and putting the nuts back on. Might need to get someone to hold the bonnet so it doesn't come off.
The other brackets in the bag go between the wing and the chassis. Remove an existing bolt, probably the bolt around the suspension turret and slide it inbetween the wing and the chassis.
Not step by step but hope it helps, it how the TEIN ones fit and cant imagine Top Secret ones would be much different.