Only doing up to Marichyaasana C (half the page), I also skip harder postures. I'm trying to do it everyday, except on Saturdays, and I also don't practice on Full moon & New moon days.
The first two Sun Salutations are the hardest. The rest should be added incrementally as you grow in your practice.
Be patient. You're not expected to go through the entire practice, even if you've been practicing daily for 10 years.
Only stretch as long as you can still breathe properly.