Yes SS is great and I view it as a great complement to RPD. I got a coach for specifically olympic lifting not for SS. Olympic lifts are very difficult to execute well and coaching is almost a neccesity if you want to move up after a certain point. The coach however overworked me and I was never able to fully recover and felt slower and not as explosive after 4 months with him. I think once or twice a week would have been ideal but I was in there 3 times a week almost every week. He was giving me lessons for almost free! So I thought I had to take advantage.
It could have been my low carb diet getting in the way, my massive alcohol consumption at this time, my early a.m. workouts or other smaller injuries that I ignored, but my progress slowed substantially when I dropped my SS routine for oly lifting. My strength started progressing when I went back to SS and dropped the oly lifting and started resting more. I still do oly lifts from the hang to increase my explosiveness(if thats possible) as much as I can. Oly lifts are supposedly the ultimate gift to the body with respects to speed, power, flexibility and overall applicability to all things functional in life.
But, yes, if you are having trouble with the lifts get a coach. It is vitally important to have good form first before putting on weight. I had some pretty annoying shoulder problems when oly lifting with bad form. Thankfully I quit in time that no permanent damage set it in.
If you can't find a coach, record yourself and put the videos up on here so we can critique you. You can even visit strengthmill.com and put your vids there, Rippetoe himself posts a lot and will comment on your form.