Around here on the river launches that I do(are mostly by myself), the trailer placement is the key. The current/wind will always present a challenge. Nothing beats experience so if you get the chance drive down to the ramp and watch others. Even then it pays to have and extra set of socks and shoes just in case. I've put on guides and a plank on the trailer allows me to drive the boat onto the trailer, hook her up, step on the plank and finish cranking her up. Then because the ramp I launch on is steep, i'll step in the back on the pickup and get out by the cab, this ramps been known to be slippery this time of the year. This way if I slip I put a little distance between me and the river.