I tried installing a fireplace lintel for a log burner, but couldn't finish it..

Hi all 👋 This week I finally challenged myself to work on removing bricks from our chimney breast for a concrete prestressed lintel to open it up for a large stove.
Sadly the small one before was far too small, and squashed in a tiny gap and wasn't sufficient enough for our large living and dining room.
But I didn't just dive into this living room makeover, because after removing the 80s fascia brickwork back in May, we noticed the chimney stack was tied into the structural breeze blocks which also support the catnic on the left hand side.
I also hit a brick wall trying to finish it.
TOOLS & MATERIALS I USED:
*As an Amazon Associate, I earn from qualifying purchases made through links.
Pre stressed P100 Concrete lintel 1200mm
Concrete screws geni.us/Concre... {amazon}
Evolution Disc Cutter geni.us/EvoDis... {amazon} {GIFTED}
Stihl Bluetooth Ear Defenders geni.us/SqeaEG6 [Amazon]
Stanley combi drill geni.us/fN8isKn (amazon)
Stanley impact driver geni.us/8vo6o15 (amazon)
Einhell hammer drill geni.us/EgMCBBJ [Amazon]
Spirit level geni.us/j9BKfb (amazon)
WORX WX812 18V (20V Max) Cordless Brushless Angle Grinder 125mm - 4.0Ah Battery geni.us/worxan... {Amazon}
Bolster chisel set geni.us/Y7zZ0 (amazon)
Hammer geni.us/stanle... [Amazon]
Safety goggles geni.us/ybBDFs {Amazon}
JSP mask geni.us/jspmask {Amazon}
Rubble bags geni.us/CDo94 [Amazon]
Boat/torpedo spirit set geni.us/hB7F {amazon}
Werner portable workbench platform geni.us/3wx4a0K {Amazon}
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