Using engine braking by dropping gears on corner entry will unsettle the bike less, you'll get used to what revs to be at for this, start slowly/mildly - as stevie says, get your braking done before you tip in. Start by going into corners too slow, rather than too fast and wobbling round/crashing, build up speed as your confidence in tyres etc grows BUT don't keep pushing and pushing - find your comfort zone and don't exceed it - no prizes for visits to A&E.
If you think you're running out of turn, about to go too wide, push forwards on the inside bar - countersteering, practice it at slower speeds, see how much easier and safer it makes those turns feel. Shift your weight over on to a bum cheek, you don't have to be proper hanging off and knee down for this to help - lean in to the inside mirror, weight over the front of the bike; again, get this done before you tip in to unsettle the bike as little as possible.
Use mostly your front brake - again, gradually learn how much stopping power you have so you'll know how late you can leave it - and remember, brakes take time to warm up just as tyres do so don't pile into the first corner ten minutes from home on full anchors at the last second! And you CAN use rear brake in corners, but be much gentler with it - it can provide a steadying influence in those long, fast sweepers.
Vanishing point - where the 2 kerbs/carriageway edges meet in perspective, will give you earliest possible warning of where the road is going on blind corners. But don't forget to take any opportunities to look across the bend you are about to enter if your vision isn't blocked by hedges/walls/trees etc - this gives you more pre-warning of how tight it's going to get than anything else.
And of course, the oldest one in the book, look at where you want to go - if you stare at that hedge on the outside of the bend, that's where you'll wind up.