You may hate me for this, but I would never use bronze guides for road use. I have seen a few cylinder heads that have been using bronze guides, & they have been really clapped out, & I mean really bad. Also seen bronze seats worn down into the head. Cast iron for my road bikes. I know a lot of you would disagree, but from what I have seen, I will stick to what I feel safe with.
As for removing & replacing guides, use a proper puller. In the past I used to turn good fitting drifts up & use them for hammering the guides out & back in. Problem is, it can crack the guides when removing them & swell the bores in or crack them when hammering them in.