Those grey/black plastic screws that hold the stock engine cover on can be removed with a large socket. 21 or 22mm from memory. You could also try a pair of multigrip pliers but you may damage the plastic a bit.
You can re-use the grey/black screws to secure the heat shield if you want, otherwise go grab some M6 bolts that are about 20mm long and they will do the job.
Ah, also the plastic screws at the back of the engine actually have a 10mm nut underneath, so if you undo those first you will find the screws much easier to get off.
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