Remember, spring pressures on hydraulic rollers are ATLEAST 100 and sometimes closer to 200 lbs/sq. inch. Pushing on them with your fingers isn't going to tell you anything. I know money doesn't grow on trees but if you're worried about it, you should be able to find brand new stock replacement lifters for ~100 bucks.
When you're putting the lifters in, just make sure the roller is down. That's all that matters....