You need to check the shoe has the correct volume to suit your foot shape, which really just means the quantity of space your foot takes up in the boot compared to the remaining space. If there's too little volume in the shoes, they'll feel too tight when laced up. If there's too much volume, there will be significant creasing at the flex point (where your toes bend when you walk), or the eyelets will be nearly touching when you lace the boots up.
Volume can be increased or decreased by wearing socks of different thickness, increased using a different lacing technique or decreased using different footbeds. If you're not sure, bring your boots into your local store and our experts will happily take a look for you.