switched from leg press to squats today.
congrats! You will get a much better and more complete lower body strength stimulus from squats, once you get used to them.
squats are much harder!! i was squatting 180 and it was challenging. to leg press 250 was definitely easier.
i may not have even been going low enough.
yea, youre not lifting in a vertical path against gravity with the leg press, not nearly the level of stabilization required in the leg press that the squat requires, and much more hip involvement in the squat. Your glutes will take some time to catch up with your quads most likely, and be the limiting factor in your squats for a while. Good thing is, they get stronger in a hurry once you start targeting them more.
is it bad if i feel pain in the base of my spine? i felt that at some point.
yes, very bad, you need to learn to lock in the LUMBAR spine along with the thoracic. spread the chest AND push your belt buckle down to point directly at the floor before you begin.
and should i be putting my weight towards the FRONT of my foot, or towards the back?
Keep the weight centered right over the middle of the foot, or the exact area that you tie the knot in your shoe your laces.