if I get out of position during squats/deads I feel a little sciatica, and sometimes when I walk. Should I continue to lift keeping a good eye on my positions or take a break?
This is a pretty loaded question as there can be several causes of sciatica symptoms, and no one here is qualified to give you medical advice. Definitely don’t do anything that aggravates it, and I would suggest you seek out a good chiropractor or physical therapist to determine the source of the pain. If it’s muscular you should be able to resolve it quickly. Simply taking a break won’t do much other than a reduction in symptoms, so be proactive and figure out what’s causing it.
I agree with Andrew 100%. Sometimes a good chiropractor can resolve the issue immediately, depending on what the source of the issue is. I would look for a good practitioner and see if you can get it resolved, but also focus on technique. I would rather have somebody lift lighter to get good technique dialled in, than lift heavier where form breaks down.
You partly answered your own question on the first line by saying “getting out of position” but I’ll take it one step further by saying this has huge value in every day movements (walking , sitting, crouching, turning etc). The books mentioned above by Brian will go into further detail about how, when, and why to move certain ways so that your metaphorically putting “money in the bank” or in this case your “spine bank”. I know it sounds a little silly but I myself came back into strongman after some major herniations in my spine thanks to Brian’s help. To my surprise, it was my day to day movement that were causing more aggravation than getting out of position during my lifting (not that that isn’t important but I hope you’re getting my drift). Get some major info with the books above, get a therapist/professional who understands what you do for a living and hobbies (lifting, hiking etc) so that they can further assess your pain triggers. Remember you want to really focus on the cause of your pain not just attacking the symptoms. Great info above and I hope to be adding just a little more to get you out of pain brother. Best of luck!!