One tool I use that has worked well for me is a plain razorblade. I also have one of the "hold and fold" tools, and have found it a dream to use. Once I have the photo-etch to bend under the appropriate "holder", lined up along the fold line/seam, I take a razor blade, slip it under the front edge of the photo-etch piece, and lift up, keeping the blade of the razor underneath the fold line/seam. Lift up to the appropriate shape/angle, and then release the piece from the holder. Have had good luck with this, vice trying to bend with a pair of needle nose pliers.
To attach them to the plastic, I'll rough up the gluing area of the photo-etch with a oiece of fine sandpaper, then apply a very small amount of superglue, usually with a toothpick or needle. I use a viscosity of glue that is 20-30 seconds setting time, so can play with the location if need be.
Works for the things I do, but I only have 1/35th, but that principle should work for 1/48 scale as well...(just need some better eye glasses!)
Good luck! Cheers!
Tim