Pochettino's burden is very heavy because Chelsea is currently a team that is in a very downturn and right now they are overhauling a lot of players in the squad so Pochettino has to reorganize this team from the start.
If the Chelsea owners are very realistic with the clubs situation; then i would say that Pochettino burden at Chelsea is not heavy. Its a tough and doable task. Over 9 first team players are sold and replaced with very young talents which means its a rebuild under Pochettino
For me, i think it would be magic if Pochettino is able to get champions league football with that squad; they are all new, no chemistry, no depth; just too many new signings. Time will tell