Lexcuse

So I needed advice with applying Dynamat sound deadening materials to my car. I’m upgrading the audio system to the new Lexus OEM Audio Plus and decided to buy about 20 square feet of the Dynamat material. I was thinking of applying some to the front doors, trunk lid, and front wheel wells/ floor area. I think the Lexus IS 250 Sport already has good cabin noise insulation so this is to supplement that.

I know how to remove the door panels, but how do I get to the surface of the trunk lid and front wheel well/ floor area?