Oh yeah, totally! I mean, I remember being overwhelmed when DS was that age too. I have since learned so much but he's seven now! It's like you need to start studying it before you even get pregnant, madness.
My top tips would be:
Rear face for as long as is practical and affordable for you. If that means just waiting until they outgrow the baby seat, this is okay. But do research what is available.
Avoid the super, super cheap options which are made by Nania. Unfortunately they trade under 100s of names, so it's hard to find, but avoid: Kiddicare own brand, Argos own brand, Baby Start, Fisher Price and Babyweavers. If you're unsure about a seat, compare it to seats of these brands and if it looks identical in shape, avoid. Another sign is weirdly shiny, cheap looking material, like cheap cycling shorts, very shallow sides (low side impact protection), where there is a 5 point harness that tightens like a rucksack, rather than with one-pull from below. For booster seats, curved, insubstantial belt guides which don't look as though they would hold the seatbelt fast in place, and for harnessed seats, flimsy, thin belt guides for the seatbelt which look like they might snap if you push them too hard.
You don't have to spend £400 to get a good car seat. There are cheaper options which are good. Britax often have a "basic" model which is good. I trust Britax but they are not the only good brand. Graco also produce mid-range seats but their seats are hit and miss on quality as I understand.
If you're wavering between two models, look for reviews, not only of user quality but of safety. Which? Don't publish their results online but you can access them at your local library. You can also look at the German site ADAC: www.adac.de/infotestrat/tests/kindersicherung/kindersitz-test/
Scroll down and just above the yellow table, the left hand drop-down list is a list of brands. Romer is Britax. Peg Perego is Mamas and Papas. I think the others are the same :) Then it's pretty self explanatory - green = good, red = bad, yellow = middle.