Route Planning advice London > SW

I'm planning on having a crack at this on Friday, weather permitting.
https://www.strava.com/routes/5121480
Outside of the London/Surrey borders and East Devon my knowledge of the roads and climbs is pretty poor.
I have used Google street view to check anything that looks as if it may be a bit risky, but would welcome any input on alternative routes or hills to avoid.
What's that climb out of Alton, is it as bad as it looks?
https://www.strava.com/routes/5121480
Outside of the London/Surrey borders and East Devon my knowledge of the roads and climbs is pretty poor.
I have used Google street view to check anything that looks as if it may be a bit risky, but would welcome any input on alternative routes or hills to avoid.
What's that climb out of Alton, is it as bad as it looks?
Bianchi C2C - Ritte Bosberg - Cervelo R3
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Comparing the segment you posted it actually looks even easier than Box Hill
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Ramps up at the end a couple of times but perfectly do able. It's steeper and lumiere than box hill but not as long.
https://connect.garmin.com/modern/course/12535882
More seriously that part of the route is well planned.
The only bit of the whole route that looks unpleasant to me is the main road A354 around Salisbury. I think that might be quite busy.
Are you stopping over-night on the way or is this a monster day ride? An overnight stop would allow you to enjoy the ride more, have a leisurely lunch and cake stop, and see prettier places rather than just make time. How can you not go up Gold Hill in Shaftesbury on the way past? And why avoid the New Forest?