Primo makes a number of good points. Personally I favour doing similar training on and off season, the difference being higher intensity in off season due to increased opportunities to train and/or recover. For example rapid cycling of reps/rep ranges and the emphasis of the session/exercises, the book I mentioned by Fleck and Kraemer expands on this.
Regarding self teaching power cleans etc, I think it's reasonably feasible and worth the effort. Even one session with a decent coach can make a significant difference if you can find a way. There are some great resources on Sean Waxman's site, Catalyst Athletics, Greenwood Weightlifting, Iron Mind/Jim Schmitz, amongst others.
One very brief tip: start off with a wooden stick or similar and/or an empty bar, do plenty of volume/technique work, even with light weights the movements are beneficial, especially if you squat all the way down.
What position do you play? Strengths, weaknesses, injuries etc?
I've found osteopaths to be quite effective for a number of injuries/tweaks, especially backs. Maybe try to find one a knowledgeable friend recommends?
Alternatively/additionally you may want to try high pulls but I'd recommend just learning cleans and/or snatches for now.