[Closed] Any suggestions how to drill holes through crumbling plaster?

I'm trying to put up some shelves, but my walls are 20mm of crumbling plaster over red brick. My attempts have led to me having to patch a 15x15cm hole! Time for a beer!

Anyone have any suggestions how to do this and get the shelf level?

I'm thinking I might be able to v.slowly drill through the plaster, turn on the hammer action to get through the brick then fill with No More Nails and push in a rawl plug. Has anyone tried this?