The tenderloins are very easy to get to. I skin out the side of the animal facing up, pull off the front quarter, then back quarter, then backstrap, scraps of meat on neck and other areas, then finally the tenderloin. Roll the animal over and do the other side. It helps to have a second guy. For the tenderloin, find the floating short ribs behind the rib cage. Push the stomach away from the spine (helps to have the second guy do this) and reach in along the inner spine to find the tenderloins. I use my fingers to loosen it up, and use my knife sparingly and carefully to cut both ends of the tenderloin. Pretty easy... Where you run into some difficulty is when the stomach starts bloating. Sometimes it helps to partially gut it at this point so that the guts have somewhere to go, allowing space to get to the tenderloin... I don't deal with the heart and liver - so no advice there...